HOMESCHOOL AND DISTANCE LEARNING
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Lesson 7: Adding and Subtracting Big Numbers

Answer Key for Activity 3 - posted from Durham, NC

Here is the answer key for Activity 3:
831 - 697 = 134
992 - 874 = 118
534 - 295 = 239
654 - 471 = 183

1. Betty baked 225 cupcakes. She put vanilla frosting on 130 cupcakes and chocolate frosting on the rest. How many cupcakes had chocolate frosting? (225 - 130 = 95 cupcakes)

2. A total of 362 people attended the soccer game. Jane counted 170 adults in the crowd. How many children attended the game? (362 - 170 = 192 children)

3. Mrs. Smith counted the number of birds that visited her bird feeder each month. In March she counted 106, and in April she counted 211. How many more birds visited her bird feeder in April than in March? (211 - 106 = 105)