Year 1 Counting in tens - decade numbers worksheet

“Counting in tens to fifty” is free to print, with no account. It is the first sheet in the Year 1 maths unit “Counting in tens - decade numbers”, for children aged 5 to 6, 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. Week 5 of the year, 5 sheets in the unit.

Free sample · answers on the last page

Counting in tens to fifty

Name: ____________ · Date: ____________
Year 1 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can count forwards and backwards in tens to 50.

A Look back3 min

1.
What comes after 7?
2.
How many cubes?
3.
Which number is bigger, 12 or 9? Write the bigger number.

B Watch me, then you4 min

Mia counts forwards in tens. She starts at 20.

Watch me

Start at 20.

Count on one ten: 30.

Count on one more ten: 40.

Each jump adds ten.

Now you

1.
Count forwards in tens from 30: 30, 40,

C Your turn5 min

1.
Count forwards in tens: 0, 10,
2.
Count forwards in tens: 10, 20,
3.
Count backwards in tens: 40, 30,
4.
Count backwards in tens: 50, 40,

Say it out loud: What stays the same each time you count in tens?

D Spot the mistake2 min

Kit says: “After ten, counting in tens, the next number is thirteen.”

1.
What number comes after 10 when you count in tens?

E Think deeper3 min

1.
Write all the decade numbers between 15 and 45.

How did it feel?

I can do it Nearly Not yet

For the grown-up

Counting in tens to fifty · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 8

2. 14

3. 12

B

1. 50

C

1. 20 If your child writes 13, they have said ten and three. Counting in tens means adding ten each time.

2. 30 If your child writes 21, they counted on in ones. Jump by a whole ten each time.

3. 20

4. 30 If your child writes 39, they took away one. Take away a whole ten each time.

D

1. 20 If your child writes 13, they have said ten and three. 13 is a teen number, not a decade number. Ten and ten make 20. Point to 20 on the line.

E

1. 20, 30, 40 If your child writes 25 or 35, they counted on in tens from 15. Decade numbers end in 0. Find them on the strip.

Words to use

Say“Start on the number you are given and say the next ten.”

Instead of“Count every single number from one.”

After the sheet

Make piles of ten buttons or pasta pieces. Count the piles in tens: 10, 20, 30.

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:

Counting in tens to 100(with a plan)
Groups of 10(with a plan)
Counting groups of ten(with a plan)
Decade numbers in order(with a plan)

Every Year 1 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.

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