Subtract 99 from multiple of 10
for 5th grade
Subtract 99 from a number by first subtracting 100 and then adding 1 to the result
Subtract 99 from multiple of 10
When you subtract from a large number, you can sometimes use simple tricks to help you. This is especially so when the number to be subtracted has a unit value of 1 or 9.
When subtracting 99, it is often easier to first subtrat 100, and then subtract 1 more to get the answer.
130 - 99 = (130 - 100) + 1 = 30 + 1
Of course, this trick also works when the initial number is not a multiple of 10:
137 - 99 = (137 - 100) + 1 = 37 + 1
You can use a similar technique whenever the number to be subtracted has a unit value of 9 (or 1 in which case you subtract 1 rather than add as the second step).
Below is a table showing the first 8 question answer pairs for the topic "Subtract 99 from 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 "Subtract 99 from multiple of 10" is in the category Add + Subtract for 5th grade (ages 10 to 11).
Revise 'Subtract 99 from multiple of 10' with one of our games for 5th grade
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 *
