# Know Your Numbers: Adding with Tens and Hundreds

In this worksheet, students improve their mental addition by adding two and three digit numbers that include tens and hundreds.

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Mental Addition/Subtraction to 1000

Difficulty level:

### QUESTION 1 of 10

In this worksheet, you have to complete the sum given, by working out the answer to the addition.

Example 1

Add the numbers:

50 + 78

Answer

First we add the units 0 + 8 = 8

Then we add the tens, 50 + 70 = 120

Then we combine the two results to get  120 + 8 = 128

The answer is 128

Example 2

Add the numbers:

500 + 78

Answer

First we add the units 0 + 8 = 8

Then we add the tens, 00 + 70 = 70

Then we add the hundreds, 500 + 000 = 500

Then we combine the three results to get   500 + 70 + 8 = 578

The answer is 578

Add the numbers:

40 + 66

Add the numbers:

80 + 76

Add the numbers:

90 + 18

Add the numbers:

60 + 68

Add the numbers:

60 + 66

Add the numbers:

900 + 36

Add the numbers:

800 + 96

Add the numbers:

600 + 81

Add the numbers:

900 + 44

Add the numbers:

300 + 10

• Question 1

Add the numbers:

40 + 66

CORRECT ANSWER
106
EDDIE SAYS
First we add the units 0 + 6 = 6
Then we add the tens, 40 + 60 = 100
Then we combine the two results to get  100 + 6 = 106
• Question 2

Add the numbers:

80 + 76

CORRECT ANSWER
156
EDDIE SAYS
First we add the units 0 + 6 = 6
Then we add the tens, 80 + 70 = 150
Then we combine the two results to get  150 + 6 = 156
• Question 3

Add the numbers:

90 + 18

CORRECT ANSWER
108
EDDIE SAYS
First we add the units 0 + 8 = 8
Then we add the tens, 90 + 10 = 100
Then we combine the two results to get  100 + 8 = 108
• Question 4

Add the numbers:

60 + 68

CORRECT ANSWER
128
EDDIE SAYS
First we add the units 0 + 8 = 8
Then we add the tens, 60 + 60 = 120
Then we combine the two results to get  120 + 8 = 128
• Question 5

Add the numbers:

60 + 66

CORRECT ANSWER
126
EDDIE SAYS
First we add the units 0 + 6 = 6
Then we add the tens, 60 + 60 = 120
Then we combine the two results to get  120 + 6 = 126
• Question 6

Add the numbers:

900 + 36

CORRECT ANSWER
936
EDDIE SAYS
First we add the units 0 + 6 = 6
Then we add the tens, 00 + 30 = 30
Then we add the hundreds, 900 + 000 = 900
Then we combine the three results to get   900 + 30 + 6 = 936
• Question 7

Add the numbers:

800 + 96

CORRECT ANSWER
896
EDDIE SAYS
First we add the units 0 + 6 = 6
Then we add the tens, 00 + 90 = 90
Then we add the hundreds, 800 + 000 = 800
Then we combine the three results to get   800 + 90 + 6 = 896
• Question 8

Add the numbers:

600 + 81

CORRECT ANSWER
681
EDDIE SAYS
First we add the units 0 + 1 = 1
Then we add the tens, 00 + 80 = 80
Then we add the hundreds, 600 + 000 = 600
Then we combine the three results to get   600 + 80 + 1 = 681
• Question 9

Add the numbers:

900 + 44

CORRECT ANSWER
944
EDDIE SAYS
First we add the units 0 + 4 = 4
Then we add the tens, 00 + 40 = 40
Then we add the hundreds, 900 + 000 = 900
Then we combine the three results to get   900 + 40 + 4 = 944
• Question 10

Add the numbers:

300 + 10

CORRECT ANSWER
310
EDDIE SAYS
First we add the units 0 + 0 = 0
Then we add the tens, 00 + 10 = 10
Then we add the hundreds, 300 + 000 = 300
Then we combine the three results to get   300 + 10 + 0 = 310
---- OR ----

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