큰 수의 덧셈과 뺄셈 단원 종합

B.1Round each number to the place named, then add or subtract to estimate.

1. 1
   Nearest thousand: $81,293+75,855$
2. 2
   Nearest thousand: $73,429+17,120$
3. 3
   Nearest thousand: $45,388+95,419$
4. 4
   Nearest thousand: $23,180-15,131$

B.2Add or subtract.

1. 5
   345892

   +42762
2. 6
   865212

   +91468
3. 7
   420436

   −24110
4. 8
   281955

   −83464

B.3Fill in the missing number.

1. 9
   $\boxed{}-5,199=$ $28,849$
2. 10
   $\boxed{}+53,169=$ $87,373$
3. 11
   $\boxed{}-4,492=$ $28,205$
4. 12
   $\boxed{}+39,977=$ $57,363$

B.4Fill in the missing number.

1. 13
   $(41+40)+3=$ $41+(\boxed{}+3)$
2. 14
   $(44+20)+39=$ $44+(\boxed{}+39)$
3. 15
   $(11+27)+12=$ $11+(\boxed{}+12)$
4. 16
   $(32+13)+6=$ $32+(\boxed{}+6)$

B.1Estimate Sums & Differences

1. 1$81,000+76,000=157,000$
2. 2$73,000+17,000=90,000$
3. 3$45,000+95,000=140,000$
4. 4$23,000-15,000=8,000$

B.2Add & Subtract Whole Numbers

1. 5388,654
2. 6956,680
3. 7396,326
4. 8198,491

B.3Complete Addition & Subtraction Sentences

1. 934,048
2. 1034,204
3. 1132,697
4. 1217,386

B.4Properties of Addition

1. 1340
2. 1420
3. 1527
4. 1613