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

Front

What is addition?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

Front

What is subtraction?

Back

Subtraction is the process of taking one number away from another.

Front

What is a two-digit number?

Back

A two-digit number is a number that has two places, such as 10 to 99.

Front

How do you add two-digit numbers?

Back

To add two-digit numbers, align the numbers by place value and add each column, starting from the right.

Front

How do you subtract two-digit numbers?

Back

To subtract two-digit numbers, align the numbers by place value and subtract each column, starting from the right.

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 the plus sign (+) mean?

Back

The plus sign means to add numbers together.

Front

What does the minus sign (−) mean?

Back

The minus sign means to take away or subtract one number from another.

Front

If you have 15 cookies and you bake 28 more, how many cookies do you have in total?

Back

15 + 28 = 43 cookies.

Front

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

Back

22 - ? = 16, so 22 - 16 = 6 deer ran away.