What you need to know

Things to remember:

  • Check how much is increasing from number to number, then just add it on to the number on the right.
  • If your adding 100s, the first number will increase 1, 2, 3. Then you can just add on the 00s. 100, 200, 300…

Normally we need to find out which number comes next: 8, 16, 24, 32, …

Step 1: Notice that we add 8 each time

8 \textbf{+8} = 16

16 \textbf{+8} = 24

Step 2: Add 8 to the last number to find the next number

16 \textbf{+8} = 24

Extra: If we want to keep counting more multiples of 8, keep adding 8 each time!

32, 40,48 , 56, 64, …

When counting in 50s and 100s, there is an easy trick. You just need to count in 5s and 10s first then you can add the zeros.

Counting in 50s is like counting in 5s – we just multiply everything by 10!

5, 10, 15, 20, 25, …

50, 100, 150, 200, 250, …

Same again here – multiply the 10 times table by 10 to count in 100s.

10, 20, 30, 40, 50, …

100, 200, 300, 400, 500, …

Example Questions

Question 1: Find the next number in this sequence.

4, 8, 12, 16 …

Answer

We can see that each time we add 4:

4 \textbf{+4} = 8

8 \textbf{+4} = 12

So we need to add 4 to the last number in the sequence:

16 \textbf{+4} = 20

 

So our answer is 20.

Question 2: Find the next number in this sequence.

100, 200, 300, 400 …

Answer

We can see that each time we add 100:

100 \textbf{+100} = 200

200 \textbf{+100} = 300

So we need to add 4 to the last number in the sequence:

400 \textbf{+100} = 500

So our answer is 500.