# Complete the Sum 4

**This Complete the Sum quiz will test you on subtraction.**

What you have been doing in this series of 11-plus verbal reasoning quizzes is basic algebra, where a symbol stands in for a number. We hope that when you begin algebra in secondary school you will be ahead of the game.

If you haven't already played our first three quizzes in this series, please do go back and play them first. Only when you have got 40 out of 40 will you be a whizz at maths!

Enjoy the final quiz in the Complete the Sum series. As always, take your time and look at the questions and answers carefully before choosing.

26 + 7 = 18 + ?

13

14

15

16

Answer: 15

This is because 26 + 7 = 33. 18 + ? = 33. This makes 15 the only possible answer.

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