소수의 사칙연산 단원 종합

M.1Add or subtract. Line up the decimal points.

1. 1
   67.288

   −39.740
2. 2
   31.18

   +15.10
3. 3
   23.570

   +56.997
4. 4
   17.60

   +41.13

M.2Round each decimal to the place named, then add or subtract to estimate.

1. 5
   Nearest tenth: $16.306+14.56$
2. 6
   Nearest tenth: $1.09+19.13$

M.3Use the fact given to find each product or quotient.

1. 7
   $81\times 45=3,645,\text{ so }0.81\times 4.5=$ 
2. 8
   $88\times 74=6,512,\text{ so }0.88\times 0.74=$ 

M.4Multiply.

1. 9
   8.86

   ×8.2
2. 10
   5.52

   ×1.6
3. 11
   14.22

   ×2.4
4. 12
   0.63

   ×9.5

M.5Multiply or divide.

1. 13
   $7.7÷10^1=$ 
2. 14
   $0.04\times 10^3=$ 

M.6Divide.

1. 15
   8318.8
2. 16
   121039.32

M.7Divide until there is no remainder. Write each quotient as a decimal.

1. 17
   877
2. 18
   849

M.8Divide.

1. 19
   3.46.052
2. 20
   6.829.172

M.1Add & Subtract Decimals

1. 127.548
2. 246.28
3. 380.567
4. 458.73

M.2Estimate Sums & Differences of Decimals

1. 5$16.3+14.6=30.9$
2. 6$1.1+19.1=20.2$

M.3Where Does the Decimal Point Go?

1. 73.645
2. 80.6512

M.4Multiply Decimals

1. 972.652
2. 108.832
3. 1134.128
4. 125.985

M.5Multiply & Divide by Powers of Ten

1. 130.77
2. 1440

M.6Divide Decimals by Whole Numbers

1. 1539.85
2. 1686.61

M.7Division with Decimal Quotients

1. 179.625
2. 186.125

M.8Divide Decimals

1. 191.78
2. 204.29