4
Many ways to show 18
Learner’s Book 1: Unit 9, pp. 121–123
GoalShow one number in many ways: with a picture, with a number track, with words and as 10 and ones.
New words
represent · show a number in a different waydigit · one number sign, like 1 or 9pattern · things arranged in a way we can see
Explanation
We can show the same number in many different ways. Take 18. We can write the digits 1 and 8. We can write the word eighteen. We can show 18 dots in ten frames, with a full ten and 8 ones. We can write 10 + 8 = 18. We can find 18 on the number track. We can draw 18 apples in two rows. However we show it, the number is still 18.
Worked examples
18 as a number sentence: 10 + 8 = 18. The whole is 18.
18 on the number track is the square after 17 and before 19.
18 in words is eighteen. The digits are 1 and 8.
Class activity
Show it: choose a number from 11 to 20. Show it in 4 different ways on paper: with dots, with the digits, with the word and as 10 and some more. Ask your partner to guess your number first from the dots.
Practice
1
What number is shown?
16
2
19 is 10 and how many more?
9
3
Write 20 in words.
twenty
4
Show 14 as 10 + ?
10 + 4 = 14