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Use your "close to" knowledge to estimate the following. The first one is done for you. а. 0.49 x 102 is about half of 100, or 50 b. 32% of 12 C. 94% of 500 d. 0.52 x 789 е. 23% of 81 f. 35% of 22 g. 76% of $210

Use your "close to" knowledge to estimate the following. The first one is done for you. а. 0.49 x 102 is about half of 100, or 50 b. 32% of 12 C. 94% of 500 d. 0.52 x 789 е. 23% of 81 f. 35% of 22 g. 76% of $210

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter7: Percents
Section7.2: Percents And Proportions
Problem 2E
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Use your "close to" knowledge to estimate the following. The first one is done for you. 8. 0.49 x 102 is about half of 100, or 50 a. b. 32% of 12 C. 94% of 500 d. 0.52 x 789 е. 23% of 81 f. 35% of 22 g. 76% of $210 9. Evaluate each student's reasoning. If the reasoning can easily be improved, tell how. a. For 20 x $19.95, I said 20 x $20 and 20 x $1, because $19 is %3D about $20 and 0.95 is about 1. So about $400 + $20 = $420." b. "25.3% of 119.2 would be about 0.3 x 120, or 36." c. "0.514 x 8.06 is about 1 × 8 = 8."
Transcribed Image Text:Use your "close to" knowledge to estimate the following. The first one is done for you. 8. 0.49 x 102 is about half of 100, or 50 a. b. 32% of 12 C. 94% of 500 d. 0.52 x 789 е. 23% of 81 f. 35% of 22 g. 76% of $210 9. Evaluate each student's reasoning. If the reasoning can easily be improved, tell how. a. For 20 x $19.95, I said 20 x $20 and 20 x $1, because $19 is %3D about $20 and 0.95 is about 1. So about $400 + $20 = $420." b. "25.3% of 119.2 would be about 0.3 x 120, or 36." c. "0.514 x 8.06 is about 1 × 8 = 8."
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