Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 909 · 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: 18 × 60 = 1088. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 586 + 676 = 1262. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 68 × 22 = 1500. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 53 = 2597. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 47 × 98 = 4613. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 66 = 1972. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 479 + 581 = 1060. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 70 × 38 = 2663. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 951 + 548 = 1499. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 405 + 434 = 831. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 379 + 248 = 627. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 554 + 373 = 924. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 24 × 45 = 1080. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 21 = 771. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 254 + 915 = 1166. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 86 × 94 = 8084. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 460 + 503 = 959. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 804 + 361 = 1165. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 29 × 58 = 1685. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 366 + 992 = 1350. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 93 × 48 = 4472. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 671 + 239 = 902. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 43 × 87 = 3741. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 12 × 16 = 192. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 843 + 132 = 975. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 620 + 348 = 968. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 145 + 522 = 669. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 23 × 85 = 1955. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 49 × 94 = 4606. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 987 + 345 = 1334. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 73 × 20 = 1460. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 33 = 726. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 30 × 28 = 840. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 22 × 15 = 330. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 767 + 204 = 971. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 31 × 50 = 1550. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 89 × 40 = 3560. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 971 + 875 = 1849. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 18 × 98 = 1764. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 96 × 21 = 2014. Correct or wrong? (a) correct (b) wrong

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