Decomposing & Composing Numbers to 20

Front

What is decomposing a number?

Back

Decomposing a number means breaking it down into smaller parts or numbers that add up to the original number.

Front

What is composing a number?

Back

Composing a number means combining smaller numbers to make a larger number.

Front

What is the missing number in 3 + ___ = 13?

Back

10

Front

What is the missing number in 10 - ___ = 3?

Back

7

Front

What two numbers make 10?

Back

1 and 9, 2 and 8, 3 and 7, 4 and 6, 5 and 5.

Front

What is an addend?

Back

An addend is a number that is added to another number.

Front

What is a sum?

Back

A sum is the result of adding two or more numbers together.

Front

What is a number sentence?

Back

A number sentence is a mathematical statement that shows a relationship between numbers using symbols like +, -, =.

Front

What is the missing addend in 5 + ___ = 7?

Back

2

Front

If you have 4 apples and you add 3 more, how many apples do you have?

Back

7 apples.