Do I Add or Subtract?

Front

What is the primary operation used to find the difference between two numbers?

Back

Subtraction

Front

What is the primary operation used to combine two quantities into a total?

Back

Addition

Front

In the context of word problems, when would you use subtraction?

Back

When you need to find out how much is left after some quantity has been removed or lost.

Front

In the context of word problems, when would you use addition?

Back

When you need to find a total after combining two or more quantities.

Front

If a theater has 450 seats and 286 are occupied, how do you find the number of empty seats?

Back

Use subtraction: 450 - 286 = 164 empty seats.

Front

If Mrs. Thomas had 158 pencils and lost 89, how do you calculate how many she has left?

Back

Use subtraction: 158 - 89 = 69 pencils remaining.

Front

If David has 138 tools and receives 94 more, how do you find the total number of tools he has?

Back

Use addition: 138 + 94 = 232 tools.

Front

What is the result of 450 - 286?

Back

164

Front

What is the result of 158 - 89?

Back

69

Front

What is the result of 138 + 94?

Back

232