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Envision Math 2.0: Grade 6, Volume 1

EM

Envision Math 2.0: Grade 6, Volume 1 View details

Review

Exercise 13 Page 56

To add decimals, line up the decimal points so that place-value positions correspond.

557

Practice makes perfect

Before we find the exact sum, we can make an estimate by rounding each addend. We will round 121.3 to 121 and 435.7 to 436 because they are the closest whole numbers. 121+436=557

The sum of 121.3 and 435.7 is about 557. Now we can find the exact sum. To add decimals, we line up the decimal points so that place-value positions correspond.

decimal points aligned

Now we add the decimals, just as we would with whole numbers, and place the decimal point in the answer.

91.2+89.9=181.1

The answer 557.0, or simply 557. This number is exactly the same as our estimation!

Subchapter links

Topic Essential Question p.55

Vocabulary Review p.55

Use Vocabulary in Writing p.55

1 Fluently Add, Subtract, and Multiply Decimals p.56

2 Fluently Divide Whole Numbers and Decimals p.56

3 Mutliply Fractions p.57

4-5 Understand and Divide with Fractions p.57

6 Divide Mixed Numbers p.58

7 Solve Problems with Rational Numbers p.58