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Number patterns
Joyful Mathematics: Chapter 9
GoalCarry on number patterns that go up by the same amount each time.
New words
skip · jump over some numbersgoes up by · how much it grows each timenumber pattern · numbers that follow a rule
Explanation
Numbers can make patterns too. 2, 4, 6, 8 goes up by 2 each time. 5, 10, 15, 20 goes up by 5. 10, 20, 30, 40 goes up by 10. First find how much the numbers go up by. Then carry on.
| up by 2 | 2, 4, 6, 8, 10 |
| up by 5 | 5, 10, 15, 20, 25 |
| up by 10 | 10, 20, 30, 40, 50 |
Worked examples
Counting by 2s: 2, 4, 6, 8, 10 are marked.
Counting by 5s: 5, 10, 15, 20, 25, 30 are marked.
Counting by 10s: 10, 20, 30, 40, 50 are marked.
Class activity
Hop and count. Draw boxes numbered 1 to 30 on the ground with chalk. Hop only on 5, 10, 15, 20, 25 and 30. Then hop on 2, 4, 6 and so on. What do you notice about the numbers you land on?
Practice
1
What comes next? 4, 6, 8, __
10
2
What comes next? 15, 20, 25, __
30
3
Fill the gap: 30, 40, 50, __, 70.
60
4
Count back by 2: 20, 18, 16, __
14
5
Which number is hidden by the question mark?
| 12 | 14 | ? | 18 |
16