Year 6 Use equivalence and compensation to simplify and solve addition calculations worksheet

“Move it to make a round number” is free to print, with no account. It is the first sheet in the Year 6 maths unit “Use equivalence and compensation to simplify and solve addition calculations”, for children aged 10 to 11, and takes about 20 minutes.

Print it on A4. The child's pages come first; the answers, and what each wrong answer tells you, are on the grown-up page that follows. Weeks 3 to 4 of the year, 10 sheets in the unit.

Free sample · answers on the last page

Move it to make a round number

Name: ____________ · Date: ____________
Year 6 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can add by moving some of one number to the other to make a round number, keeping the total the same.

A Look back3 min

1.
3000 + 500 =
2.
70 + 80 =
3.
4,520 4,502

B Watch me, then you4 min

Ola has 29 stickers. Her friend gives her 45 more. How many stickers does Ola have now?

Watch me

29 is only 1 away from 30.

Move 1 from the 45 to the 29: 29 + 1 = 30 and 45 − 1 = 44.

Now add 30 + 44 = 74. Ola has 74 stickers, the same total as 29 + 45.

Now you

1.
Work out 38 + 49.

C Your turn6 min

1.
997 + 425 =
2.
997 + 638 =
3.
997 + 852 =
4.
997 + 486 =

Say it out loud: What stayed the same in every row, and what changed? Why does moving 3 from 425 still give the same total?

D Spot the mistake3 min

Ali says: “97 + 53 = 153, because 97 + 3 = 100 and 100 + 53 = 153.”

1.
What is 97 + 53?

E Think deeper4 min

1.
Which suits redistribution better, 998 + 247 or 463 + 358? Why?

How did it feel?

I can do it Nearly Not yet

For the grown-up

Move it to make a round number · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 3500

2. 150

3. >

B

1. 87 If your child gets 89, they added 2 to 38 but left 49 as it was. Move the 2 out of the 49 as well, so the total stays the same.

C

1. 1422 If your child gets 1425, they added the 3 to 997 but did not take it from 425. Move the 3 out of the 425 too.

2. 1635

3. 1849

4. 1483

D

1. 150 If your child writes 153, they copied Ali's mistake. Ali added 3 to 97 but left 53 unchanged, so the 3 was counted twice. Take the 3 out of the 53: 100 + 50 = 150.

E

1. Look for: 998 + 247, because 998 is only 2 away from 1000. Neither 463 nor 358 is close to a round hundred. Also praise a child who spots that 358 is 2 from 360.

Words to use

Say“Is either number close to a round one? Move only as much as you need, then add.”

Instead of“Use column addition every time, even when you can see a quicker way.”

After the sheet

Put out 47 buttons in one pile and 38 in another. Move 2 buttons across, then count each pile and add them. Did the total change?

Tick what your child got right in StudyDen. Anything missed comes back in a later Look back box, so there's no need to redo the sheet.

The rest of this unit

9 more sheets come with a StudyDen plan, in teaching order:

Moving tenths to make wholes(with a plan)
Moving amounts, same whole(with a plan)
Keeping equations balanced(with a plan)
When one part changes(with a plan)
Adjust from a known fact(with a plan)
Known facts in my head(with a plan)
Finding missing parts(with a plan)
Adjust the known total(with a plan)
Budgets and round numbers(with a plan)

Every Year 6 maths worksheet

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