Unit Review: Adding & subtracting whole numbers

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

1. 1
   Nearest thousand: $55,241-47,049$
2. 2
   Nearest thousand: $25,549+71,225$
3. 3
   Nearest thousand: $85,474+72,196$
4. 4
   Nearest thousand: $33,709-30,753$

B.2Add or subtract.

1. 5
   865572

   −72618
2. 6
   705301

   +52093
3. 7
   388131

   −28229
4. 8
   669603

   +85853

B.3Fill in the missing number.

1. 9
   $\boxed{}+25,300=$ $81,595$
2. 10
   $\boxed{}+19,960=$ $40,481$
3. 11
   $\boxed{}+16,428=$ $76,080$
4. 12
   $96,043-\boxed{}=$ $60,639$

B.4Fill in the missing number.

1. 13
   $(25+23)+36=$ $25+(\boxed{}+36)$
2. 14
   $(44+39)+34=$ $44+(\boxed{}+34)$
3. 15
   $(48+49)+35=$ $48+(\boxed{}+35)$
4. 16
   $(20+29)+17=$ $20+(\boxed{}+17)$

B.1Estimate Sums & Differences

1. 1$55,000-47,000=8,000$
2. 2$26,000+71,000=97,000$
3. 3$85,000+72,000=157,000$
4. 4$34,000-31,000=3,000$

B.2Add & Subtract Whole Numbers

1. 5792,954
2. 6757,394
3. 7359,902
4. 8755,456

B.3Complete Addition & Subtraction Sentences

1. 956,295
2. 1020,521
3. 1159,652
4. 1235,404

B.4Properties of Addition

1. 1323
2. 1439
3. 1549
4. 1629