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In this worksheet, students practise solving problems using two-digit numbers and ones.

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 100

Difficulty level:

### QUESTION 1 of 10

Can you add together the number of packets of cakes (there are ten cakes in each packet) with the number of loose cakes?

Example:

Two packets of ten cakes and nine loose cakes?

 29 = 20 + 9

Work out the sum and then write the missing number in the box below.

 23 = 20 + ?

Work out the sum and then write the missing number in the box below.

 21 = 20 + ?

Work out the sum and then write the missing number in the box below.

 22 = 20 + ?

Work out the sum and then write the missing number in the box below.

 21 = ? + 1

Work out the sum and then write the missing number in the box below.

 29 = ? + 9

Work out the sum and then write the missing number in the box below.

 27 = 20 + ?

Work out the sum and then write the missing number in the box below.

 25 = 20 + ?

Work out the sum and then write the missing number in the box below.

 25 = ? + 5

Work out the sum and then write the missing number in the box below.

 26 = 20 + ?

Work out the sum and then write the missing number in the box below.

 29 = 20 + ?
• Question 1

Work out the sum and then write the missing number in the box below.

 23 = 20 + ?

3
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 3 extra cakes is 23.
• Question 2

Work out the sum and then write the missing number in the box below.

 21 = 20 + ?

1
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 1 extra cake is 21.
• Question 3

Work out the sum and then write the missing number in the box below.

 22 = 20 + ?

2
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 2 extra cakes is 22.
• Question 4

Work out the sum and then write the missing number in the box below.

 21 = ? + 1

20
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 1 extra cake is 21.
• Question 5

Work out the sum and then write the missing number in the box below.

 29 = ? + 9

20
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 9 extra cakes is 29.
• Question 6

Work out the sum and then write the missing number in the box below.

 27 = 20 + ?

7
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 7 extra cakes is 27.
• Question 7

Work out the sum and then write the missing number in the box below.

 25 = 20 + ?

5
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 5 extra cakes is 25.
• Question 8

Work out the sum and then write the missing number in the box below.

 25 = ? + 5

20
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 5 extra cakes is 25.
• Question 9

Work out the sum and then write the missing number in the box below.

 26 = 20 + ?

6
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 6 extra cakes is 26.
• Question 10

Work out the sum and then write the missing number in the box below.

 29 = 20 + ?
9
EDDIE SAYS
2 packets of 10 cakes = 20 cakes plus 9 extra cakes is 29.
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