3
Bigger and smaller up to 20
Joyful Mathematics: Chapter 4
GoalFind the bigger or smaller number and put numbers in order up to 20.
New words
biggest · the mostsmallest · the leastin order · one after the other, smallest first
Explanation
Numbers further along the number row are bigger. 19 is bigger than 14. 14 is smaller than 19. Of 12, 8 and 15, the biggest is 15 and the smallest is 8. To put numbers in order, find the smallest first. Then find the next smallest. If a number is missing in a row, look at the numbers beside it.
Worked examples
Which is bigger, 13 or 18? 18 is further along. 18 is bigger.
12, 8 and 15: the smallest is 8 and the biggest is 15.
Put 17, 12 and 15 in order from smallest: 12, 15, 17.
Class activity
Number towers. Make towers of 12, 15 and 18 blocks, or draw them. Which tower is the tallest? Which is the shortest? Put the towers in order from the shortest to the tallest.
Practice
1
Which number is bigger?
19.
2
What is the smallest of 13, 9 and 16?
9.
3
What is the biggest of 16, 19 and 11?
19.
4
Write in order from smallest: 18, 11, 14.
11, 14, 18.
5
Write the missing numbers: 13, __, 15, __, 17.
14 and 16.