Addition and subtraction

This problem is designed to help children to learn, and to use, the two and three times tables.

Here are some short problems for you to try. Talk to your friends about how you work them out.

What happens when you add three numbers together? Will your answer be odd or even? How do you know?

This investigates one particular property of number by looking closely at an example of adding two odd numbers together.

Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?

Can you follow the rule to decode the messages?

This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.

Can you use the information to find out which cards I have used?

This challenge extends the Plants investigation so now four or more children are involved.

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?