Two-step problems to 20

Adding & taking away

Ages 5-735 minutes7 tasksNumbers & Maths

Name:

Date:

What we are learning

Solve missing-number and two-step problems within 20.

You will need: Pencil, Number line to 20, Whiteboard for jottings

I'm thinking of a number. I add 5 and get 12. What was my number?

Strategy helper

make ten firstcount oncount backuse the inversedraw a jotting

Work these out. A number line will help.

8 + 5 =9 + 6 =7 + 7 =14 − 6 =17 − 9 =12 − 8 =6 + 8 =15 − 7 =

Fill in the box to make each sum correct.

6 + ☐ = 13☐ + 8 = 1516 − ☐ = 9☐ − 5 = 119 + ☐ = 20☐ + 7 = 18

Read carefully. Show your working.

1. Milo has 15 stickers. He gives 6 to Bianka, then gets 4 more. How many now?

2. There are 12 apples. 5 are eaten and 3 more are put in the bowl. How many apples?

3. Jay puts 9 books on a shelf, then 7 more. He takes 4 away. How many books are on the shelf?

Working and answers

Solve each sum, then write the subtraction that checks it.

Ten quick questions. Use jottings if you need them.

9 + 5 =8 + 6 =18 − 9 =16 − 8 =7 + 9 =20 − 11 =13 + 4 =19 − 6 =

Make up a two-step problem about something at home (shopping, laying the table). Write it out and solve it.

My problem and my answer

Make up your own two-step problem for a friend, then check their answer with the inverse.