1
Ten and some more
Discover Mathematics: Chapter 3
GoalCount, read and write 11, 12 and 13 as ten and some more.
New words
eleven · ten and one moretwelve · ten and two morethirteen · ten and three more
Explanation
After ten comes eleven. Eleven is ten and one more. Twelve is ten and two more. Thirteen is ten and three more. On two ten-frames, we fill the first frame with ten counters and put the rest on the second frame. We write these numbers with two digits. The 1 on the left means one group of ten. The digit on the right tells how many more.
Worked examples
Twelve is ten and two more. The first frame is full and there are 2 counters on the second frame.
Thirteen is ten and three more. Count: 10 on the first frame, then 11, 12, 13.
Hana has an egg tray with 10 eggs and 2 more eggs on the table. That makes 12 eggs.
Class activity
Ten and more. Put out 10 pebbles in a row, then add 1 more. Count them all and say eleven. Add another and say twelve, then another and say thirteen. Each time, say: ten and two more, ten and three more.
Practice
1
How many sheep are there?
11
2
How many carrots are there?
12
3
Here are 10 stars and 3 more stars. How many stars are there in all?
13
4
Say the numbers from ten to thirteen out loud: ten, eleven, twelve, thirteen.
10, 11, 12, 13
5
What number comes after 12?
13