Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 982 · 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: 43 × 39 = 1679. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 53 × 69 = 3657. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 73 = 1752. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 265 + 162 = 427. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 75 = 6005. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 51 × 68 = 3468. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 53 = 954. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 83 × 61 = 5063. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 67 × 30 = 2010. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 747 + 939 = 1686. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 160 + 974 = 1134. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 324 + 508 = 825. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 140 + 163 = 303. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 215 + 970 = 1190. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 140 + 387 = 527. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 633 + 980 = 1613. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 63 × 19 = 1195. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 267 + 145 = 412. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 26 × 55 = 1433. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 531 + 956 = 1487. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 612 + 524 = 1144. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 598 + 168 = 758. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 76 × 58 = 4405. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 30 × 85 = 2550. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 52 × 21 = 1092. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 974 + 409 = 1389. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 91 × 30 = 2723. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 61 × 18 = 1098. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 959 + 423 = 1382. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 142 + 460 = 598. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 889 + 513 = 1402. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 27 × 87 = 2349. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 852 + 393 = 1246. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 88 × 27 = 2368. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 47 = 945. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 33 × 33 = 1089. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 88 × 34 = 2993. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 47 × 36 = 1692. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 799 + 369 = 1168. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 644 + 263 = 907. Correct or wrong? (a) correct (b) wrong

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