Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 820 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 680 + 278 = 962. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 18 × 71 = 1278. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 41 × 87 = 3567. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 616 + 529 = 1152. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 502 + 849 = 1343. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 642 + 643 = 1280. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 37 × 32 = 1183. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 431 + 505 = 930. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 36 × 17 = 612. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 44 × 37 = 1628. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 593 + 838 = 1431. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 548 + 585 = 1127. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 650 + 407 = 1057. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 71 × 88 = 6256. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 520 + 590 = 1110. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 96 = 8248. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 19 × 28 = 532. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 585 + 840 = 1425. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 37 × 50 = 1850. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 156 + 318 = 472. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 48 × 43 = 2064. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 95 × 47 = 4465. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 46 × 34 = 1564. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 69 = 966. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 942 + 944 = 1886. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 69 × 78 = 5385. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 94 × 99 = 9305. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 64 × 99 = 6336. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 74 × 70 = 5180. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 96 × 12 = 1147. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 738 + 386 = 1120. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 140 + 471 = 611. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 290 + 284 = 572. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 639 + 679 = 1312. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 181 + 146 = 327. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 20 × 51 = 1024. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 92 = 2387. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 88 × 72 = 6339. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 37 × 31 = 1152. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 866 + 550 = 1416. Correct or wrong? (a) correct (b) wrong

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