Unit 4: More Adding and Subtracting with Two-Digit Numbers

Front

What is subtraction?

Back

Subtraction is taking away a number from another number. For example, 10 - 4 = 6.

Front

What is addition?

Back

Addition is putting together two or more numbers to find a total. For example, 5 + 3 = 8.

Front

What does it mean to solve a problem?

Back

To solve a problem means to find the answer or solution to a question.

Front

What is a two-digit number?

Back

A two-digit number is a number that has two places, like 34 or 58.

Front

How do you find out how many are left?

Back

You can subtract the number taken away from the total. For example, if you have 10 and give away 3, you have 10 - 3 = 7 left.

Front

What is a number sentence?

Back

A number sentence is a mathematical statement that shows a relationship between numbers using operations like addition or subtraction.

Front

What does 'left' mean in math problems?

Back

'Left' refers to what remains after some has been taken away. For example, if you have 10 apples and give away 4, you have 6 apples left.

Front

How do you write a subtraction equation?

Back

A subtraction equation shows the total, what is taken away, and what is left. For example, 10 - 4 = 6.

Front

What is the total of 15 and 28?

Back

The total of 15 and 28 is 43. (15 + 28 = 43)

Front

If you have 22 deer and 16 are left, how many ran away?

Back

You can find out by subtracting: 22 - 16 = 6. So, 6 deer ran away.