Mental calculations

There are 95 NRICH Mathematical resources connected to Mental calculations
Picture Your Method
problem

Picture Your Method

Age
7 to 11
Challenge level
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Can you match these calculation methods to their visual representations?
Fruity Pairs
problem

Fruity Pairs

Age
5 to 7
Challenge level
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Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?
Let's Get Flexible!
article

Let's Get Flexible!

In this article for primary teachers, Ems outlines how we can encourage learners to be flexible in their approach to calculation, and why this is crucial.
Tables Teaser
problem

Tables Teaser

Age
5 to 7
Challenge level
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How will you work out which numbers have been used to create this multiplication square?
Six Numbered Cubes
problem

Six Numbered Cubes

Age
7 to 11
Challenge level
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This task combines spatial awareness with addition and multiplication.
Overlaps
problem

Overlaps

Age
11 to 14
Challenge level
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Can you find ways to put numbers in the overlaps so the rings have equal totals?
Double or Halve?
problem

Double or Halve?

Age
5 to 7
Challenge level
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Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?
Difference Sudoku
problem

Difference Sudoku

Age
14 to 16
Challenge level
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Use the differences to find the solution to this Sudoku.
Unit Differences
problem

Unit Differences

Age
5 to 7
Challenge level
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This challenge is about finding the difference between numbers which have the same tens digit.