List

Number Operations and Calculation Methods - Short Problems

Small tomato seedlings in pink pots.
problem

In Sum-Mary

Age
11 to 14
Challenge level
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What does the sum of these three numbers tell us about their product?

Small tomato seedlings in pink pots.
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Magic Error

Age
11 to 14
Challenge level
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Two of the numbers in a 4×4 magic square have been swapped. Can you work out the sum of these numbers?

Small tomato seedlings in pink pots.
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Subtracting to 2008

Age
11 to 14
Challenge level
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Can you work out the sum of the missing digits in this subtraction?

Small tomato seedlings in pink pots.
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Down and Along

Age
11 to 14
Challenge level
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Can you work out the values of J, M and C in this sum?

Small tomato seedlings in pink pots.
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354972

Age
11 to 14
Challenge level
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What is the remainder when 354972 is divided by 7?

Small tomato seedlings in pink pots.
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50, 50, 50 and 50

Age
11 to 14
Challenge level
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Aroon says his age is 50 years, 50 months, 50 weeks and 50 days. What age will he be on his next birthday?

Small tomato seedlings in pink pots.
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Walk or Run?

Age
11 to 14
Challenge level
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Can you work out how long it will take for John to walk to and from school?

Small tomato seedlings in pink pots.
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Split Clock Face

Age
11 to 14
Challenge level
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Use 2 straight lines to split the clock face into 3 parts so that the sums of the numbers in each of the parts are equal.

Small tomato seedlings in pink pots.
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Reverse Subtraction

Age
11 to 14
Challenge level
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What is the value of c in this subtraction?

Small tomato seedlings in pink pots.
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Missing Digits

Age
11 to 14
Challenge level
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Can you find the missing digits in this calculation?

Small tomato seedlings in pink pots.
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Fly Away

Age
11 to 14
Challenge level
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Can you work out the values of the digits in this addition sum?

Small tomato seedlings in pink pots.
problem

Hot Dogs

Age
11 to 14
Challenge level
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How many hot dogs did this hot dog lover eat on the first day of her binge?

Small tomato seedlings in pink pots.
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Identical Digit Multiplication

Age
11 to 14
Challenge level
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77 is multiplied by another two-digit number with identical digits. What is the product?

Small tomato seedlings in pink pots.
problem

Bus Route

Age
11 to 14
Challenge level
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How far apart are the first and last bus stops in this bus route?

Small tomato seedlings in pink pots.
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Debasing the Coinage

Age
11 to 14
Challenge level
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How much lighter will £5 worth of 5p's be with these new lighter coins?

Small tomato seedlings in pink pots.
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Carry Over

Age
11 to 14
Challenge level
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Each letter stands for a different digit, and S is non-zero. Which letter has the lowest value?

Small tomato seedlings in pink pots.
problem

2014 Even Numbers

Age
11 to 14
Challenge level
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What is the difference between the sum of the first 2014 odd numbers and the sum of the first 2014 even numbers?

Small tomato seedlings in pink pots.
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Rolling Along the Trail

Age
11 to 14
Challenge level
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What could be the scores from five throws of this dice?

Small tomato seedlings in pink pots.
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Roses and Carnations

Age
11 to 14
Challenge level
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How many different bunches of flowers can this class buy for their teacher?

Small tomato seedlings in pink pots.
problem

Jam and Egg Sandwich

Age
11 to 14
Challenge level
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How many solutions can you find to this sum? Each of the different letters stands for a different number.

Small tomato seedlings in pink pots.
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Operational Decision

Age
11 to 14
Challenge level
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What symbol should be inserted to make the equation true?

Small tomato seedlings in pink pots.
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Product and Sum

Age
11 to 14
Challenge level
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When Jim rolled some dice, the scores had the same product and sum. How many dice did Jim roll?

Small tomato seedlings in pink pots.
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Latin Multiplication

Age
11 to 14
Challenge level
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Can you choose one number from each row and column in this grid to form the largest possibe product?

Small tomato seedlings in pink pots.
problem

Birthday Tables

Age
11 to 14
Challenge level
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How many tables of each type does Mark need at his birthday party?

Small tomato seedlings in pink pots.
problem

Filling Morecambe Bay

Age
11 to 14
Challenge level
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"It would take 20 million years to fill Morecambe Bay from a bath tap". What does this imply is the approximate capacity of Morecambe Bay?

Small tomato seedlings in pink pots.
problem

Bookshop

Age
11 to 14
Challenge level
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If Clara spends £23 on books and magazines, how many of each does she buy?

Small tomato seedlings in pink pots.
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Sum of Ten

Age
11 to 14
Challenge level
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The sum of ten distinct positive integers is 100. What is the largest possible value of one of the numbers?

Small tomato seedlings in pink pots.
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Quiz Question

Age
11 to 14
Challenge level
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Can you work out how many quizzes have to be played before we have a winner?

Small tomato seedlings in pink pots.
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Whole Numbers Only

Age
11 to 14
Challenge level
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Can you work out how many of each kind of pencil this student bought?

Small tomato seedlings in pink pots.
problem

Anti-Magic Square

Age
11 to 14
Challenge level
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You may have met Magic Squares, now meet an Anti-Magic Square. Its properties are slightly different - can you still solve it?

Small tomato seedlings in pink pots.
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Palindromic Milometer

Age
11 to 14
Challenge level
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At the beginning and end of Alan's journey, his milometer showed a palindromic number. Can you find his maximum possible average speed?

Small tomato seedlings in pink pots.
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So Many Sums

Age
11 to 14
Challenge level
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In this addition each letter stands for a different digit, with S standing for 3. What is the value of YxO?

Small tomato seedlings in pink pots.
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Multiple Choice

Age
11 to 14
Challenge level
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How many questions did Sarah answer correctly in this multiple choice exam?

Small pepper seedlings in orange pots.
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Currency Exchange

Age
11 to 14
Challenge level
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Dan and Ann have 9 and 8 coins respectively. What is the smallest number of coins they must swap so they end up with equal amounts of money.

Small tomato seedlings in pink pots.
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See Axes

Age
11 to 14
Challenge level
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Which digit does X represent in this column sum?

Small tomato seedlings in pink pots.
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Kangaroo Subtraction

Age
11 to 14
Challenge level
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Can you solve this 'KANGAROO' alphanumeric subtraction?

Small tomato seedlings in pink pots.
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ABC Addition

Age
11 to 14
Challenge level
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Can you work out what a, b and c are in this sum?

Small tomato seedlings in pink pots.
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Digit Deletion

Age
11 to 14
Challenge level
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What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?

Small tomato seedlings in pink pots.
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Divisible by 55

Age
11 to 14
Challenge level
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Choose the digits $a$ and $b$ so that this number is divisible by 55.

Small tomato seedlings in pink pots.
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Sum of 1s

Age
11 to 14
Challenge level
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Can you find the last 5 digits of this sum?

Small tomato seedlings in pink pots.
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Comparing Totals

Age
11 to 14
Challenge level
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Can you work out the solution to this tricky summation problem?

Small tomato seedlings in pink pots.
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Squares and Cubes

Age
11 to 14
Challenge level
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How many positive two-digit numbers are there whose square and cube both end in the same digit?

Small tomato seedlings in pink pots.
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Last Digit

Age
11 to 14
Challenge level
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What is the last digit in this calculation involving powers?

Small tomato seedlings in pink pots.
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Sum One Special

Age
11 to 14
Challenge level
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Three different integers have a sum of 1 and a product of 36 - what are they?