### There are 17 results

Broad Topics >

Calculations and Numerical Methods > Mental addition & subtraction

##### Age 7 to 16 Challenge Level:

Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?

##### Age 11 to 16 Challenge Level:

The puzzle can be solved with the help of small clue-numbers which
are either placed on the border lines between selected pairs of
neighbouring squares of the grid or placed after slash marks on. . . .

##### Age 7 to 16 Challenge Level:

A Sudoku with clues given as sums of entries.

##### Age 7 to 11 Challenge Level:

These grids are filled according to some rules - can you complete
them?

##### Age 5 to 11 Challenge Level:

A game for 2 players. Using 2 dice, some counters and a games board, can you form a line of counters from one side of the board to the other?

##### Age 7 to 11 Challenge Level:

A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.

##### Age 5 to 11 Challenge Level:

A game for 1 person to play on screen. Practise your number bonds whilst improving your memory

##### Age 7 to 11 Challenge Level:

A game to be played against the computer, or in groups. Pick a 7-digit number. A random digit is generated. What must you subract to remove the digit from your number? the first to zero wins.

##### Age 7 to 14 Challenge Level:

Can you spot the similarities between this game and other games you know? The aim is to choose 3 numbers that total 15.

##### Age 7 to 11 Challenge Level:

Dicey Operations for an adult and child. Can you get close to 1000 than your partner?

##### Age 11 to 14 Challenge Level:

Who said that adding, subtracting, multiplying and dividing couldn't be fun?

##### Age 7 to 11 Challenge Level:

A game for 2 or more players with a pack of cards. Practise your
skills of addition, subtraction, multiplication and division to hit
the target score.

##### Age 7 to 11 Challenge Level:

George and Jim want to buy a chocolate bar. George needs 2p more
and Jim need 50p more to buy it. How much is the chocolate bar?

##### Age 7 to 11 Challenge Level:

A game for 2 players. Practises subtraction or other maths
operations knowledge.

##### Age 5 to 11 Challenge Level:

Number problems for inquiring primary learners.

##### Age 7 to 11 Challenge Level:

Resources to support understanding of multiplication and division through playing with number.

##### Age 7 to 16 Challenge Level:

An ordinary set of dominoes can be laid out as a 7 by 4 magic rectangle in which all the spots in all the columns add to 24, while those in the rows add to 42. Try it! Now try the magic square...