1
Counting from 11 to 20
Learner’s Book 1: Unit 9, pp. 118–120
GoalCount forwards to 20 and find the missing numbers in a number track.
New words
teen numbers · 13 to 19: a ten and some onesmissing · not there, you need to find ittwenty (20) · two tens
Explanation
Let us count past 10, all the way to 20. The numbers after 10 are 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20. We call 13 to 19 the teen numbers. The number track has two rows. The first row goes from 1 to 10. The second row goes from 11 to 20. 20 is two tens. To find a missing number, count along the track and listen for the gap.
Worked examples
Two numbers are hiding on this track. Count along the second row: 11, 12, 13, 14, 15, then a gap. 16 is missing. Then 17, 18, a gap. 19 is missing.
After 14 comes 15. Before 20 comes 19. Next to 16 are 15 and 17.
Count the stars: 1, 2, 3 … 12. There are 12 stars.
Class activity
Number hide-and-seek: write the numbers 11 to 20 on 10 small cards and put them in order on the floor. Your partner closes their eyes. Take away one or two cards. Can they say which numbers are missing?
Practice
1
Write the missing numbers.
11, 14, 17 and 18
2
What number comes after 14?
15
3
What number comes before 20?
19
4
How many balls are there?
13