Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 48 · 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: 16 × 17 = 272. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 861 + 613 = 1474. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 222 + 498 = 720. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 817 + 575 = 1400. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 62 × 88 = 5456. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 68 × 77 = 5232. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 96 × 42 = 4031. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 631 + 611 = 1248. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 59 × 25 = 1475. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 16 × 67 = 1072. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 49 × 13 = 639. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 395 + 813 = 1207. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 92 × 95 = 8740. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 367 + 891 = 1250. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 305 + 419 = 719. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 35 × 42 = 1470. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 86 × 66 = 5676. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 31 × 16 = 498. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 96 × 33 = 3167. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 97 × 65 = 6305. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 47 × 24 = 1128. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 27 × 38 = 1031. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 97 × 65 = 6308. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 59 = 4602. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 14 × 51 = 714. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 74 × 71 = 5254. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 70 × 95 = 6642. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 73 × 24 = 1752. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 52 = 988. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 82 × 31 = 2541. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 806 + 952 = 1751. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 385 + 833 = 1218. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 551 + 769 = 1320. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 869 + 301 = 1174. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 17 = 578. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 42 × 76 = 3198. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 628 + 842 = 1470. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 54 = 5083. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 975 + 677 = 1658. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 269 + 698 = 969. Correct or wrong? (a) wrong (b) correct

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