Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 100 · 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: 47 × 36 = 1699. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 14 × 96 = 1338. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 351 + 220 = 574. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 12 × 73 = 877. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 935 + 853 = 1787. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 156 + 614 = 770. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 944 + 626 = 1570. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 50 × 49 = 2450. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 189 + 193 = 385. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 27 × 18 = 490. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 81 × 81 = 6562. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 969 + 776 = 1745. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 567 + 407 = 974. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 476 + 770 = 1250. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 167 + 607 = 774. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 120 + 348 = 468. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 51 × 49 = 2495. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 71 = 1491. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 302 + 973 = 1272. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 98 × 64 = 6272. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 92 × 81 = 7452. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 86 = 1892. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 64 × 36 = 2304. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 60 × 42 = 2520. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 14 × 42 = 588. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 657 + 192 = 850. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 24 × 77 = 1849. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 99 × 70 = 6930. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 57 = 1083. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 201 + 195 = 396. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 32 = 794. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 36 × 99 = 3564. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 86 × 20 = 1720. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 19 × 42 = 794. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 30 × 94 = 2820. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 29 × 96 = 2788. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 16 × 15 = 240. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 445 + 668 = 1113. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 35 × 13 = 448. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 20 × 91 = 1820. Correct or wrong? (a) wrong (b) correct

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