# Primary Maths: Doubling & Halving Resources

These activities support the develoment of halving and doubling strategies using number facts, inverses and estimating.

For ages: 7 to 8
Counting Sheep
Each sheep has a halving or doubling statement. Match up the inverse pairs by dragging the sheep into the correct pens. ... more info
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 1

For ages: 7 to 10
Doubling Machine
The doubling machine takes random numbers and doubles them but for every correct number it produces it also makes three ... more info
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

For ages: 7 to 8
Division Ducks
The banner shows a question about finding a fraction of a number. One of the ducks has the correct division statement to... more info
First used for Objective
Find unit fractions of numbers and quantities (e.g. 1/2, 1/3, 1/4 and 1/6 of 12 litres)
I can find fractions of numbers by using division
Year 3, Block E, Unit 1

For ages: 8 to 10
Mystery Number
Triangle man thinks of a number he doubles it he adds another number to it - can you use the inverse operations, doublin... more info
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

For ages: 8 to 10
Split and Double Machine
Operate the doubling machine, making the correct choices to first partition a 2 digit number, then double the tens and u... more info
First used for Objective
Identify the doubles of two-digit numbers; use these to calculate doubles of multiples of 10 and 100 and derive the corresponding halves
I can double two-digit numbers
Year 4, Block A, Unit 1

For ages: 8 to 9
Perfume Patterns
Drag and drop the perfume bottles to complete a number pattern. The numbers have to be in the correct sequence. There ar... more info
First used for Objective
Identify the doubles of two-digit numbers; use to calculate doubles of multiples of 10 and 100 and derive the corresponding halves
I can work out doubles of two-digit numbers
Year 4, Block B, Unit 3

For ages: 8 to 10
Demented Doubling
Use place value understanding to double decimal numbers (5.8, 4.9 etc.)then use the inverse facts to halve decimal numbe... more info
First used for Objective
Use knowledge of place value and addition and subtraction of two-digit numbers to derive sums and differences and doubles and halves of decimals (e.g. 6.5 2.7, half of 5.6, double 0.34)
I can double and halve decimals.
Year 5, Block E, Unit 2

For ages: 9 & 10
Percentage Cuts
Practice estimating fractions and percentages of objects by helping out top chef The Great Zoltini. Follow his instructi... more info
First used for Objective
Understand percentage as the number of parts in every 100 and express tenths and hundredths as percentages
I can estimate a simple fraction or percentage of a quantity.
Year 5, Block E, Unit 2

For ages: 6 to 7
Half and Double
Zero Gravity helps you practise your number bonds, finding half (1/2) and doubles of numbers up to 20. Investigate the r... more info
First used for Objective
Understand that halving is the inverse of doubling and derive and recall doubles of all numbers to 20, and the corresponding halves
I know the doubles of all the numbers up to 20
Year 2, Block B, Unit 3

For ages: 6 to 7
Half and Half Again
Use the vocabulary of halves and quarters to investigate how many fish are in the pond. Use practical methods to find a ... more info
First used for Objective
Find one half, one quarter and three quarters of shapes and sets of objects
I can use my knowledge of halving numbers to help me to work out half and a quarter of a set of objects
Year 2, Block E, Unit 1

For ages: 6 to 7
Jigsaw Doubles
Complete the jigsaws by matching a doubled number to the corresponding halved number fact. Recall doubles of numbers up ... more info
First used for Objective
Use knowledge of number facts and operations to estimate and check answers to calculations
I can check answers to calculations involving doubling by halving the answer
Year 2, Block B, Unit 3

For ages: 5 to 6
Double Dominoes
Visualise doubling by using dominoes and learn to recall doubles of numbers up to 10. Use the number line to answer the ... more info
First used for Objective
Recall the doubles of all numbers to at least ten
I can recall or work out the doubles of numbers up to 5 + 5 or more
Year 1, Block B, Unit 2