Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 974 · 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: 17 × 55 = 935. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 12 × 13 = 156. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 273 + 219 = 492. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 352 + 359 = 714. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 551 + 218 = 768. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 299 + 501 = 800. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 355 + 290 = 647. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 26 × 26 = 676. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 87 × 78 = 6786. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 56 × 12 = 672. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 254 + 992 = 1246. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 295 + 252 = 546. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 594 + 848 = 1442. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 75 × 78 = 5845. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 92 × 34 = 3128. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 87 = 2787. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 53 × 30 = 1591. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 140 + 369 = 514. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 901 + 769 = 1662. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 691 + 728 = 1413. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 488 + 871 = 1359. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 29 × 82 = 2373. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 210 + 761 = 978. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 57 × 46 = 2622. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 74 × 28 = 2072. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 157 + 596 = 753. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 86 × 72 = 6187. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 523 + 824 = 1347. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 86 × 54 = 4650. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 12 = 456. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 278 + 711 = 981. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 803 + 185 = 988. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 364 + 284 = 648. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 66 × 19 = 1254. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 147 + 148 = 295. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 122 + 588 = 717. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 540 + 723 = 1259. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 41 × 93 = 3813. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 786 + 993 = 1779. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 593 + 444 = 1037. Correct or wrong? (a) correct (b) wrong

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