Year 3 Bridging 100: counting on and back in 10s, adding/subtracting multiples of 10 worksheet

“Crossing 100” is free to print, with no account. It is the first sheet in the Year 3 maths unit “Bridging 100: counting on and back in 10s, adding/subtracting multiples of 10”, for children aged 7 to 8, 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 4 to 5 of the year, 5 sheets in the unit.

Free sample · answers on the last page

Crossing 100

Name: ____________ · Date: ____________
Year 3 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can count on and back across 100 in 1s and 10s.

A Look back3 min

1.
10 more than 47 is
2.
Count on in 1s: 96, 97, 98,
3.
10 less than 70 is

B Watch me, then you4 min

Counting on from 98. Watch where the count crosses 100.

Watch me

Start at 98 and count on 3: 99, then 100, then 101.

99 is the last two-digit number. 100 is the first three-digit number.

So 98 plus 3 is 101.

Now you

1.
Start at 97. Count on 4 in 1s. You land on

C Your turn6 min

Count from the start number. Say each number as you go.

1.
Count on in 10s: 80, 90,
2.
Count on in 10s: 90, 100,
3.
Count back in 10s: 120, 110,
4.
Count back in 1s: 101, 100,

Say it out loud: What happens to the tens digit when the count goes past 99?

D Spot the mistake2 min

Sam says: “The number after 99 is 910.”

1.
What is the next number after 99?

E Think deeper4 min

1.
Kit counts back in 1s from 103. He says 99 is 4 steps back. Is he right? Explain how you know.

How did it feel?

I can do it Nearly Not yet

For the grown-up

Crossing 100 · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 57 If your child writes 48, they added 1 to the ones. Ten more changes the tens digit.

2. 99

3. 60 If your child writes 69, they took away 1. Ten less changes the tens digit.

B

1. 101 If your child writes 100, they counted only 3 steps. Say each number out loud as you go.

C

1. 100

2. 110 If your child writes 101, they added 1 instead of 10. Each step in 10s adds ten.

3. 100 If your child writes 90, they took away 20. Each step back in 10s takes away 10.

4. 99 If your child writes 100, they have not moved. Each step back is one less.

D

1. 100 If your child writes 910, the 9 and the 10 were put side by side. 900 plus 10 is 910, but 99 plus 1 is 100.

E

1. Look for: Yes: 102, 101, 100 and 99 are four steps back from 103.

Words to use

Say“Say the last two-digit number, then the first three-digit number, when you cross 100.”

Instead of“Tell them the answer straight away.”

After the sheet

Lay out 20 buttons in a row. Touch each one and count aloud from 91 to 110, slowing down as you cross 100.

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

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

Three ways to show it(with a plan)
Bridging 100 with small numbers(with a plan)
10 more or 10 less(with a plan)
Crossing the 100 Line(with a plan)

Every Year 3 maths worksheet

The worksheets plan opens a printable sheet for every lesson in Years 1 to 6, each with its answers on a separate page for you. It costs £6.99 a month or £59 a year for the whole family, with no free trial.

The full StudyDen plan adds the lessons themselves, marked as your child works, with the worksheets included. It is 7 days free, then £29.99 a month.

Get the worksheets Try the full plan free

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