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109 + 20

Add 109 to a multiple of 10
for 5th grade

Add 109 to a number by first adding 110 and then subtracting 1 from the result

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Add 109 to a multiple of 10

When you add to a large number, you can use simple tricks to help you. This is especially so when the large number's unit value is a 9 or a 1.

When adding 109, it is often easier to first add 110, and then subtract 1 to more easily get the answer.

For instance, if you wanted to do the sum: 70 + 109

1. 70 + 110 = 180 --first add 110
2. 180 - 1 = 179 --then subtract 1

You can use a similar technique whenever the large number's unit value is 9 (or 1 in which case you add rather than subtract as the second step).

Below is a table showing the first 8 question answer pairs for the topic "Add 109 to a multiple of 10" as used in the lessons for this topic. Our games and tests for the topic use these 8 items plus 20 additional question answer pairs.

The topic "Add 109 to a multiple of 10" is in the category Add + Subtract for 5th grade (ages 10 to 11).

1 / 8

Adding 109 to 20 by adding 110 and then subtracting 1 gives 129

109 + 20

129

2 / 8

Adding 109 to 40 by adding 110 and then subtracting 1 gives 149

109 + 40

149

3 / 8

Adding 109 to 60 by adding 110 and then subtracting 1 gives 169

109 + 60

169

4 / 8

Adding 109 to 90 by adding 110 and then subtracting 1 gives 199

109 + 90

199

5 / 8

Adding 109 to 290 by adding 110 and then subtracting 1 gives 399

109 + 290

399

6 / 8

Adding 109 to 140 by adding 110 and then subtracting 1 gives 249

109 + 140

249

7 / 8

Adding 109 to 620 by adding 110 and then subtracting 1 gives 729

109 + 620

729

8 / 8

Adding 109 to 790 by adding 110 and then subtracting 1 gives 899

109 + 790

899

Revise 'Add 109 to a multiple of 10' with one of our games for 5th grade

The beetle and the bee

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Each of our math topics for elementary are made up of between 6 and 20 question and answer pairs (both the written form and a robot voice speaking those questions and answers). Each topic can be used with all the activities on the site.

Counting * Comparing numbers * Pattern * Place value * Addition * Subtraction * Add + Subtract * Multiplication * Division * Multiply + Divide * Fractions * Decimals * Ratio + proportion * Measurements * Shapes * Position + Direction * Statistics * Algebra *

Add 109 to a multiple of 10for 5th grade

Add 109 to a multiple of 10

Revise 'Add 109 to a multiple of 10' with one of our games for 5th grade

Add 109 to a multiple of 10
for 5th grade