Using bar models to subtract | Maths | Quizalize & Oak National Academy

Starter quiz

Look at the equation 8 – 2 = 6 Which number represents the part to be subtracted from the whole?

'2' ✓
Match the word to the correct description for 10 - 3 = 7.

10

⇔

total number in the whole group ✓

3

⇔

part to be subtracted ✓

7

⇔

part that remains ✓
Tick the equation that correctly matches the picture.

8 - 1 = 9

9 - 8 = 1 ✓

1 - 8 = 9
Which picture matches this equation? 10 – 3 = 7
Jun has written an equation to represent the picture 5 - 1 = 4 Is the equation correct or incorrect?

correct ✓

incorrect
Complete the equation 9 – 5 = ______

'4' ✓

Which bar model has a whole of 6?
Which bar model represents this picture?
Tick the equation that represents this bar model.

5 - 3 = 8

8 = 5 - 3

8 - 3 = 5 ✓
Which bar model cannot represent this equation? 7 – 3 = 4
Tick the subtraction equations that match the bar model.

7 - 3 = 10

10 - 7 = 3 ✓

10 - 3 = 7 ✓

3 - 10 = 7
Which story could be represented by this bar model?

There are 10 apples. 3 of them are red. How many are not red? ✓

There are 7 apples. 3 of them are red. How many are not red?

There are 10 apples. 7 of them are green. How many are not green? ✓

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A bar model can be used to represent subtraction problems and equations.
Overlaying manipulatives on a bar model can be useful for helping to solve subtraction problems and equations.

Children may muddle the order of the numbers on a bar model and in a subtraction equation.

If children are not secure, then return to the concrete to secure understanding of this structure of subtraction.

Subtract - To separate or take away one number from another, or to decrease an amount.
Known part - A piece or section of the whole that is known.
Unknown part - A piece or section of the whole that is not known.