Checking Calculations
These activities for 7 to 10 year olds cover claculation checking strategies using knowledge of number facts, inverses, halving and doubling and rounding and estimating.
Sweet, Sweet Sums
Use addition and subtarction inverses to calculate the price of items at the shop. Input the answer by using the keypad....
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First used for Objective
Solve one-step and two-step problems involving numbers, money or measures, including time, choosing and carrying out appropriate calculations
I can explain how I solve problems
Year 3, Block B, Unit 2
Doubling Machine
The doubling machine takes random numbers and doubles them but for every correct number it produces it also makes three ...
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First used for Objective
Use knowledge of number operations and corresponding inverses, including doubling and halving, to estimate and check calculations.
I can estimate and check my calculations.
Year 3, Block B, Unit 3
Mystery Number
Triangle man thinks of a number he doubles it he adds another number to it - can you use the inverse operations, doublin...
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First used for Objective
Identify pairs of factors of two-digit whole numbers and find common multiples (e.g. for 6 and 9)
I can find all the factor pairs for a two-digit number
Year 5, Block A, Unit 2
Round of Golf
How far has Zero G hit the golf ball? Read the distance in cm and round it to the nearest 10. On the last level there ar...
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First used for Objective
Use knowledge of rounding, number operations and inverses to estimate and check calculations
I can round numbers in a calculation to help me estimate the answer to the calculation
Year 4, Block B, Unit 1
Bun Bonanza
Breadhead is buying buns for his burger van but how many does he need? Use rounding and number facts to estimate if his ...
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First used for Objective
Use knowledge of rounding, place value, number facts and inverse operations to estimate and check calculations
I can estimate and check the result of a calculation
Year 5, Block A, Unit 1
Calculator Checking
Enter the inverse of a calculation into the calulator to check if it's correct....
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First used for Objective
Use knowledge of rounding, number operations and inverses to estimate and check calculations
I can estimate and check the result of a calculation
Year 4, Block A, Unit 1
Calculation rules
Spot the deliberate mistakes. Apply some basic maths rules to check calculations ...
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First used for Objective
Use knowledge of rounding, place value, number facts and inverse operations to estimate and check calculations
I can check whether a calculation is correct
Year 5, Block B, Unit 2
Beans Between
Use knowledge of times tables and place value to multiply multiples of ten and a hundred. Then use rounding to estimate ...
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First used for Objective
Use knowledge of rounding, place value, number facts and inverse operations to estimate and check calculations
I can estimate the result of a calculation
Year 5, Block A, Unit 2
First used for Objective
Use approximations, inverse operations and tests of divisibility to estimate and check results
I can estimate and check the calculations that I do
Year 6, Block A, Unit 1
First used for Objective
Use knowledge of rounding, place value, number facts and inverse operations to estimate and check calculations.
I can estimate and check the result of a calculation
Year 5, Block A, Unit 3
First used for Objective
Use approximations, inverse operations and tests of divisibility to estimate and check results
I can estimate and check the result of a calculation
Year 6, Block B, Unit 2
First used for Objective
Use approximations, inverse operations and tests of divisibility to estimate and check results
I know several ways of checking answers
Year 6, Block D, Unit 2