Christmas Math review

Front

What is doubling a number?

Back

Doubling a number means multiplying it by 2. For example, doubling 15 gives you 30.

Front

How do you calculate the total time for multiple activities?

Back

To find the total time, you multiply the number of activities by the time each activity takes. For example, if each game lasts 5 minutes and there are 5 games, the total time is 5 X 5 = 25 minutes.

Front

What is subtraction?

Back

Subtraction is taking one number away from another. For example, if you have 596 presents and 349 fall off, you subtract 349 from 596 to find out how many are left.

Front

How do you find the total number of items in groups?

Back

To find the total number of items in groups, multiply the number of groups by the number of items in each group. For example, 6 stockings with 7 presents each means 6 X 7 = 42 presents.

Front

What is addition?

Back

Addition is combining two or more numbers to get a total. For example, if Santa eats 30 chocolate chip cookies, 25 gingerbread cookies, and 43 sugar cookies, you add them together: 30 + 25 + 43 = 98.

Front

What is multiplication?

Back

Multiplication is a way to add the same number multiple times. For example, 5 X 5 means adding 5 five times: 5 + 5 + 5 + 5 + 5 = 25.

Front

What is the total number of cookies if you double a batch of 15 cookies?

Back

If you double 15 cookies, you have 30 cookies.

Front

If Rudolph plays 5 games for 5 minutes each, how long does he play in total?

Back

Rudolph plays for 5 X 5 = 25 minutes.

Front

How many presents does the Grinch have left after losing some?

Back

If the Grinch stole 596 presents and lost 349, he has 596 - 349 = 247 presents left.

Front

How do you calculate the total number of cookies Santa ate?

Back

To find the total cookies Santa ate, add the number of each type: 30 + 25 + 43 = 98 cookies.