1. Estimate. Round to the tens place. A. 30 + 10 = 40 B. 50 + 20 = 70 C. 20 + 10 = 30 D. 30 + 20 = 50 Hint 2. Find 84 + 57. A. 131 B. 151 C. 27 D. 141 Hint 3. Find the number that completes the number sentence. Then identify the property or rule.24 + ∅ = 18 + 24 A. 18; Associative Property of Addition B. 18; Commutative Property of Addition C. 0; Identity Property of Addition D. 6; Subtraction Rule Hint 4. Add mentally.32 + 18 + 40 A. 80 B. 70 C. 100 D. 90 Hint 5. Estimate. Round each addend to the indicated place value.221 + 32; tens A. 200 + 30 = 230 B. 220 + 30 = 250 C. 220 + 40 = 260 D. 230 + 30 = 260 Hint 6. Estimate. Round to the indicated place value.579 − 412; hundreds A. 500 − 500 = 0 B. 500 − 400 = 100 C. 600 − 400 = 200 D. 580 − 420 = 160 Hint 7. Find the sum. A. \$41,696 B. \$40,696 C. \$31,696 D. \$30,696 Hint 8. Find the sum. A. \$93,427 B. \$92,427 C. \$92,317 D. \$91,227 Hint 9. Find 623 − 509. A. 124 B. 14 C. 24 D. 114 Hint 10. Find 540 − 350. A. 200 B. 190 C. 110 D. 210 Hint 11. Find the difference. A. 534 B. 644 C. 566 D. 634 Hint 12. Subtract. A. 4,288 B. 3,388 C. 3,288 D. 3,398 Hint