Worksheet Desk

Class 1 maths worksheets

Missing numbers in addition within 20 worksheet

Find the missing number in Class 1 addition sums within 20. Practise with the blank on either side of the plus sign and check your answers.

Worked example · Count from 9 to 13

Find the missing number in 9 + ___ = 13.

Start at 9. Count the jumps to 10, 11, 12 and 13.

Four jumps give 9 + 4 = 13.

Print & practise

A4 paper · 6 questions

Print worksheet View answer key Worked example Worksheet FAQs

Practice questions

Start at the number you know and count up to the total. Write how many steps you took.

  1. 5 + ___ = 12
  2. ___ + 8 = 16
  3. 11 + ___ = 14
  4. ___ + 6 = 19
  5. 17 + ___ = 20
  6. There are 9 children in a group. Some more join and now there are 15. How many joined?

Frequently asked questions

How should I use this worksheet?

Check each answer by reading the completed addition aloud.

Where can I check the answers?

Open the separate printable answer key.

All Maths worksheets
Class 1

Number bonds to 10

Print a Class 1 number bonds to 10 worksheet. Find missing partners, make a pair of your own, and check the separate answer key.

 Class 1

Addition within 20

Practise addition within 20 for Class 1. Count on, make ten, and solve two short word problems. Print the worksheet and answer key.

 Class 1

Addition word problems within 20

Print six simple Class 1 addition word problems using fruit, toys and classroom objects. Write a number sentence and check the answers.

 Class 1

Class 1 daily Maths

Class 1 Maths practice on addition within 20. Print the worksheet and check your work with the separate answer key.

Browse by class