Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 265 · 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: 33 × 84 = 2778. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 81 × 48 = 3891. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 203 + 398 = 601. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 15 × 97 = 1453. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 16 × 34 = 545. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 73 × 58 = 4234. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 459 + 315 = 778. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 95 × 35 = 3327. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 32 = 384. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 77 × 32 = 2459. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 571 + 663 = 1234. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 664 + 286 = 958. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 346 + 295 = 641. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 948 + 276 = 1224. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 20 × 24 = 483. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 317 + 942 = 1259. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 19 × 29 = 557. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 83 × 67 = 5561. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 710 + 347 = 1055. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 40 × 12 = 472. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 48 = 1879. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 395 + 682 = 1079. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 42 × 22 = 921. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 795 + 298 = 1093. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 41 × 66 = 2706. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 35 × 44 = 1542. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 20 × 79 = 1580. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 169 + 819 = 988. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 606 + 710 = 1313. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 44 × 13 = 573. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 183 + 939 = 1122. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 55 × 78 = 4297. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 45 × 46 = 2068. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 72 × 45 = 3246. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 914 + 259 = 1175. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 283 + 426 = 707. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 34 × 24 = 816. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 772 + 359 = 1139. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 37 × 76 = 2812. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 71 × 98 = 6958. Correct or wrong? (a) wrong (b) correct

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