Year 1 Pattern in counting from 20 to 100 worksheet

“Patterns in Rows” is free to print, with no account. It is the first sheet in the Year 1 maths unit “Pattern in counting from 20 to 100”, 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 6 of the year, 5 sheets in the unit.

Free sample · answers on the last page

Patterns in Rows

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

Today I can find the pattern in each row of the hundred square.

A Look back3 min

1.
What number comes after 19?
2.
How many counters are there?
3.
What is one less than 30?

B Watch me, then you4 min

Here is one row of the hundred square. Look at the endings.

Watch me

21 to 30 is the twenties row.

21 to 29 all start with 2. The row ends with 30.

The endings go 1, 2, 3, 4. So 24 is the fourth number.

Now you

1.
Look at this row. Circle its name.
sixtiesseventieseighties

C Your turn6 min

Count the bundles of ten and the loose ones. Look at the ending each time.

1.
Ada has 4 bundles of ten straws and 1 loose straw. How many straws?
2.
Sam has 4 bundles of ten straws and 3 loose straws. How many straws?
3.
Ben has 4 bundles of ten straws and 6 loose straws. How many straws?
4.
Mia has 4 bundles of ten straws and 9 loose straws. How many straws?

Say it out loud: What do you notice about the ending of each number?

D Spot the mistake3 min

Ravi says: “The row that ends in 40 is the forties.”

1.
This row ends in 40. Circle its name.
thirtiesforties

E Think deeper3 min

Find all the numbers from 20 to 40 that end in 5.

1.
Write them here: and

How did it feel?

I can do it Nearly Not yet

For the grown-up

Patterns in Rows · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 20 If your child writes 10, they changed the ones to 0 but kept 1 ten. After 19 comes a new ten, so 2 tens is 20.

2. 14

3. 29

B

1. sixties

C

1. 41

2. 43 If your child writes 34, they have swapped the digits. Count the bundles first: 4 tens is forty, then 3 more.

3. 46 If your child writes 10, they counted each bundle as one. Count the bundles in tens first: 10, 20, 30, 40, then 6 more.

4. 49

D

1. thirties If your child circles forties, point to the first number of the row. It starts at 31, so this row is the thirties.

E

1. 25 and 35 If your child writes 15, it ends in 5 but is not between 20 and 40. Check the number is in the twenties or thirties.

Words to use

Say“Which row are we in? Look at the ending of the number first.”

Instead of“Count all the way from 1 each time.”

After the sheet

Write the numbers 21 to 30 on scraps of paper and lay them in a row. Touch each one and say its ending aloud.

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:

Crossing into a new ten(with a plan)
Counting back over the tens(with a plan)
Crossing the tens boundary(with a plan)
Hidden number detectives(with a plan)

Every Year 1 maths worksheet

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