Other tags that relate to Back to School
Time. Multiplication & division. Addition & subtraction. Estimating and approximating. Investigations. Factors and multiples. Combinations. Working systematically. Trial and improvement. Place value.There are 20 results
Broad Topics > Calculations and Numerical Methods > Estimating and approximating
Back to School
Age 7 to 11 Challenge Level:
Mr. Sunshine tells the children they will have 2 hours of homework. After several calculations, Harry says he hasn't got time to do this homework. Can you see where his reasoning is wrong?
Today's Date - 01/06/2009
Age 5 to 11 Challenge Level:
What do you notice about the date 03.06.09? Or 08.01.09? This challenge invites you to investigate some interesting dates yourself.
What's My Weight?
Age 7 to 11 Short Challenge Level:
There are four equal weights on one side of the scale and an apple on the other side. What can you say that is true about the apple and the weights from the picture?
Nice or Nasty for Two
Age 7 to 14 Challenge Level:
Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
Discuss and Choose
Age 5 to 11 Challenge Level:
This activity challenges you to decide on the 'best' number to use in each statement. You may need to do some estimating, some calculating and some research.
Whole Numbers Only
Age 11 to 14 Challenge Level:
Can you work out how many of each kind of pencil this student bought?
Countdown
Age 7 to 14 Challenge Level:
Here is a chance to play a version of the classic Countdown Game.
Four Go for Two
Age 7 to 11 Challenge Level:
Four Go game for an adult and child. Will you be the first to have four numbers in a row on the number line?
Shedding Some Light
Age 7 to 11 Challenge Level:
Make an estimate of how many light fittings you can see. Was your estimate a good one? How can you decide?
Building Patterns
Age 7 to 11 Challenge Level:
Can you deduce the pattern that has been used to lay out these bottle tops?
The Magic Number and the Hepta-tree
Age 7 to 11 Challenge Level:
Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!
Four Go
Age 7 to 11 Challenge Level:
This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?
Dicey Operations in Line for Two
Age 7 to 11 Challenge Level:
Dicey Operations for an adult and child. Can you get close to 1000 than your partner?
Nice or Nasty
Age 7 to 14 Challenge Level:
There are nasty versions of this dice game but we'll start with the nice ones...
Dicey Operations
Age 11 to 14 Challenge Level:
Who said that adding, subtracting, multiplying and dividing couldn't be fun?
Does This Sound about Right?
Age 11 to 14 Challenge Level:
Examine these estimates. Do they sound about right?
Counting Sweets
Age 7 to 14 Challenge Level:
How might you use mathematics to improve your chances of guessing the number of sweets in a jar?
Where Am I?
Age 11 to 16 Challenge Level:
From the information you are asked to work out where the picture was taken. Is there too much information? How accurate can your answer be?
A Jar of Teddies
Age 7 to 14 Challenge Level:
How many teddies are in the jar? How many teddies could you fit in your classroom?
Squaring the Circle
Age 11 to 14 Challenge Level:
Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make. . . .
NRICH is part of the family of activities in the Millennium Mathematics Project.