Year 1

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We can add 10, 20, 30, …to any number up to 50

Year 1 Unit 15

What we are learning:

Orally counting on in 10’s from different starting numbers is important because your child will start to recognize and be able to talk about the patterns they see.

Use a number line to support this. Look for and talk about patterns when counting on in 10’s – say and record the numbers. Talk about what happens to the digits and why this happens.

Always ask, What do you notice?


Activities you can do at home:

Make some bundles of 10 straws. Pick two groups, e.g. one ten and three tens and ask how many there are altogether.

In my box I have 2 bundles of 10 straws and 6 single straws.

How many straws are in the box altogether? Check by counting.

Try this with different numbers
Ask your child to put straws in the box for you to count.
Turn over a number card and put that many straws in the box.
Make sure you put the single straws in first sometimes

Look at the written number and the straws and talk about how each digit is represented by the straws. Model with bundles of straws – put down 6 straws, add a bundle of 10 and add them together (16) and another (26) and say the new total as you add each bundle of 10. This shows that the 6 doesn’t change – just the tens digit changes.
Count on in 10’s from any starting number.

Use straws or a number line to add 20 to 32.
Model adding these numbers together using straws and using a number line. Show that the different methods all give the same total.
Try with other numbers.

Good questions to ask:

Which number comes next?
How do you know?
What do you notice about the numbers?
What’s the same? What’s different?

If your child:

Finds it difficult to count on from a number in 10s
Use a number line to model this. This will also allow them to see the written numbers which will help them identify the pattern (e.g. 12, 32, 42, 52)

Extension Activity

Please use this activity when you think your child understands the unit of work. It will deepen and extend your child’s understanding of this unit.


Extension activity (PDF)