소수의 덧셈과 뺄셈 단원 종합

M.1Round each decimal to the place named, then add or subtract to estimate.

1. 1
   Nearest whole number: $33.85+52.19$
2. 2
   Nearest whole number: $20.44+54.86$
3. 3
   Nearest whole number: $42.79+77.74$
4. 4
   Nearest whole number: $87.04+51.82$

M.2Add. Line up the decimal points.

1. 5
   14.60

   +79.32
2. 6
   6.30

   +6.61
3. 7
   8.410

   +39.332
4. 8
   86.302

   +39.838

M.3Subtract. Line up the decimal points.

1. 9
   89.419

   −79.900
2. 10
   90.060

   −61.475
3. 11
   77.841

   −67.868
4. 12
   55.48

   −17.91

M.4Add or subtract.

1. 13
   70.343

   +14.600
2. 14
   18.160

   +21.985
3. 15
   14.8

   −13.1
4. 16
   5.550

   −0.291

M.1Estimate Sums & Differences of Decimals

1. 1$34+52=86$
2. 2$20+55=75$
3. 3$43+78=121$
4. 4$87+52=139$

M.2Add Decimals

1. 593.92
2. 612.91
3. 747.742
4. 8126.14

M.3Subtract Decimals

1. 99.519
2. 1028.585
3. 119.973
4. 1237.57

M.4Add & Subtract Decimals

1. 1384.943
2. 1440.145
3. 151.7
4. 165.259