Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 211 · 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: 76 × 26 = 1977. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 47 × 73 = 3438. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 316 + 507 = 828. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 837 + 580 = 1417. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 592 + 830 = 1414. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 18 × 32 = 576. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 43 × 22 = 946. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 877 + 816 = 1693. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 162 + 345 = 508. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 531 + 434 = 972. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 461 + 436 = 897. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 29 × 20 = 580. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 23 × 83 = 1909. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 99 × 73 = 7232. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 17 × 65 = 1105. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 28 = 868. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 49 = 1664. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 52 × 51 = 2652. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 545 + 350 = 895. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 770 + 784 = 1554. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 85 × 18 = 1527. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 586 + 259 = 845. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 510 + 348 = 858. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 89 × 62 = 5525. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 421 + 853 = 1275. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 36 × 41 = 1480. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 26 × 64 = 1656. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 310 + 505 = 815. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 26 × 57 = 1487. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 786 + 384 = 1172. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 88 × 99 = 8711. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 44 × 89 = 3916. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 37 × 78 = 2886. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 319 + 374 = 693. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 67 × 45 = 3015. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 83 × 35 = 2903. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 13 × 34 = 442. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 909 + 301 = 1210. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 224 + 897 = 1115. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 72 = 6408. Correct or wrong? (a) correct (b) wrong

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