Number pairs, making 10, and teen numbers (kindergarten) · lesson

Two parts make a number

and

Tap each one to count it

💡 A number can be split into two parts in many ways.

5 can be 3 and 2. It can also be 4 and 1.

Tim has 6 socks. 2 are on his feet. 4 are in the drawer. 6 is 2 and 4.

🧠 How to think about it

Hold up 5 fingers. Fold some down. The ones up and the ones down are two parts of 5.

🏡 Try it at home

Hide some of 6 pennies under a cup. Your child says how many are hidden.

💡 Count the empty boxes to find the partner that makes 10.

A ten-frame has 10 boxes. If 6 have dots, 4 are empty.

So 6 and 4 make 10. 9 and 1 make 10. 3 and 7 make 10.

🧠 How to think about it

Look at the empty boxes, not the dots. Count them. That number fills the frame to 10.

🏡 Try it at home

Draw 10 boxes in an egg carton shape. Fill some with beans. How many more make 10?

💡 A teen number is ten and some more ones.

15 is 10 and 5. 17 is 10 and 7.

The 1 in a teen number stands for the ten. So write 1 first, then the ones.

🧠 How to think about it

Seventeen sounds like seven first. But we write 1 then 7. The ten comes first.

🏡 Try it at home

Make a pile of 10 spoons and a pile of 4. Say "ten and four is fourteen." Write 14.

💡 When a frame is full, start at 10. Count on the rest.

One full frame is 10. Do not count those dots again.

Say 10, then count the extra dots. 10, 11, 12, 13, 14.

🧠 How to think about it

Two frames: one full, one with 6. Say ten. Then count 11, 12, 13, 14, 15, 16. There are 16.

🏡 Try it at home

Fill an egg carton's 10 spots with coins. Add 3 more on the side. Start at 10 and count on.