Pick the missing number in these number doubling patterns
Home / 4th grade / Pattern / Next number / Doubling each time
This topic focuses on number patterns where each subsequent number is obtained by doubling the previous one. These patterns, known as geometric sequences with a common ratio of 2, are easiest to understand by looking at examples. Let's start by looking at one such number pattern:
1 , 2 , 4 , 8 , _ , _ ...
What comes next? To find out, let's first look at the differences between each pair of consecutive numbers:
You can see that in each step, we multiply the previous number by 2 to get the next number in the sequence. That is because doubling a number is the same as multiplying it by 2. Now, let's use this rule to find the next number:
8 x 2 = 16
So, the next number in the pattern is 16. The sequence now looks like this:
1 , 2 , 4 , 8 , 16 , _ ...
If we do the next number in the sequence, it will be 16 x 2 which is 32,
1 , 2 , 4 , 8 , 16 , 32 ...
To recap, always remember the following steps when identifying the next number in a pattern that doubles the number each time:
This topic asks you to work out the next number in the pattern of numbers created by doubling the number each time.
Below is a table showing the first 6 question answer pairs for the topic "Doubling each time" as used in the lessons for this topic. Our games and tests for the topic use these 6 items plus 15 additional question answer pairs.
The topic "Doubling each time" is in the category Pattern for 4th grade (ages 9 to 10).
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