4
Greater and less on the track
Learner’s Book 1: Unit 1, pp. 25–26
GoalUse the number track to find a number that is greater or less than another number.
New words
greater · more; a bigger numberless · fewer; a smaller numbernumber track · a row of numbers from 1 to 10, in order
Explanation
On the number track the numbers get greater as you go to the right, towards 10. They get less as you go to the left, towards 1. To find a number greater than 4, look to the right of 4: 5, 6, 7, 8, 9 and 10 are all greater. To find a number less than 4, look to the left of 4: 3, 2 and 1. If you add one more object each time, the number gets 1 greater. If you take one away each time, it gets 1 less.
Worked examples
Name a number greater than 6. Look to the right of 6. The numbers 7, 8, 9 and 10 are all greater than 6.
Name a number less than 3. Look to the left of 3. The numbers 2 and 1 are less than 3.
Add one block at a time: 3 blocks, then 4, then 5, then 6. Each time the number is 1 greater.
Class activity
Build a staircase: put 1 block in the first column, 2 blocks in the next, then 3, and go on to 10. Each step is 1 greater than the step before. Then take one block away at a time from the tower of 10. Each time the number is 1 less.
Practice
1
Write a number that is greater than 7.
8, 9 or 10
2
Write a number that is less than 6.
Any of 1, 2, 3, 4 or 5 (0 is right too).
3
Which number is greater, 4 or 9?
9
4
You have 8 blocks and take 1 block away. Is the number now greater or less than 8?
Less. Now there are 7.