Subtracting Multiples of Tens/Tens and Finding Parts of 100

Front

What is the result of subtracting 10 from 30?

Back

20

Front

Calculate 70 - 50.

Back

20

Front

If you subtract 30 from a number and the result is 50, what is the number?

Back

80

Front

What number must be added to 34 to make 100?

Back

66

Front

What is 48 - 20?

Back

28

Front

What is the definition of subtraction?

Back

Subtraction is the operation of finding the difference between two numbers.

Front

What is a multiple of ten?

Back

A multiple of ten is any number that can be expressed as 10 times an integer (e.g., 10, 20, 30, etc.).

Front

How can you use mental math to subtract 20 from 48?

Back

You can round 48 to 50, subtract 20 to get 30, and then adjust back to get 28.

Front

What is the relationship between addition and subtraction?

Back

Addition and subtraction are inverse operations; one undoes the effect of the other.

Front

What is the purpose of finding parts of 100?

Back

Finding parts of 100 helps in understanding percentages and making calculations easier.