어림셈 단원 종합

C.1C.2C.3Round each number to the place shown, then estimate.

1. 1
   Nearest thousand: $6,409-2,438$
2. 2
   Nearest thousand: $6,918+7,081$
3. 3
   Nearest thousand: $8,386-3,476$
4. 4
   Nearest hundred: $2,113+9,956$
5. 5
   Nearest ten: $53\times 7$
6. 6
   Nearest hundred: $325\times 4$
7. 7
   Nearest hundred: $161\times 6$
8. 8
   Nearest hundred: $299\times 8$
9. 9
   Nearest hundred: $863-640$
10. 10
    Nearest hundred: $601+958$
11. 11
    Nearest hundred: $974-187$
12. 12
    Nearest hundred: $676+933$

C.1C.2C.3Round each number to the place shown, then estimate.

1. 1$6,000-2,000=4,000$
2. 2$7,000+7,000=14,000$
3. 3$8,000-3,000=5,000$
4. 4$2,100+10,000=12,100$
5. 5$50\times 7=350$
6. 6$300\times 4=1,200$
7. 7$200\times 6=1,200$
8. 8$300\times 8=2,400$
9. 9$900-600=300$
10. 10$600+1,000=1,600$
11. 11$1,000-200=800$
12. 12$700+900=1,600$