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In this activity, we will learn how to complete a sequence by filling in the gaps.
Example 1
Complete the sequence by filling in the gaps:
| 1 | A | 15 | 22 | 29 | B |
Answer
Look for clues.
Here we look at 15, 22 and 29 and notice that 22 - 15 = 7 and 29 - 22 = 7, so the gap is 7.
The sequence consists of numbers that increase by 7.
A = 1 + 7 = 8
B = 29 + 7 = 36
| 1 | 8 | 15 | 22 | 29 | 36 |
Example 2
Complete the sequence by filling in the gaps:
| A | 30 | B | 54 | C | 78 |
Answer
This is harder.
54 - 30 = 24
78 - 54 = 24 also.
The gap will be half this, i.e. 12.
A = 30 - 12 = 18
B = 30 + 12 = 42
C = 54 + 12 = 66
| 18 | 30 | 42 | 54 | 66 | 78 |
How do you feel about trying some questions now?
