Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 441 · 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: 332 + 121 = 459. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 292 + 918 = 1209. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 72 × 65 = 4680. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 895 + 355 = 1256. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 855 + 140 = 995. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 131 + 516 = 655. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 93 × 94 = 8746. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 21 × 12 = 257. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 71 = 2838. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 414 + 284 = 698. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 54 × 35 = 1890. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 812 + 413 = 1217. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 30 × 62 = 1860. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 24 × 37 = 888. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 23 × 88 = 2024. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 847 + 285 = 1137. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 46 × 36 = 1655. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 67 × 66 = 4422. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 14 × 46 = 651. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 646 + 736 = 1382. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 23 × 50 = 1150. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 43 × 41 = 1763. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 801 + 146 = 947. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 25 × 78 = 1956. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 741 + 134 = 875. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 63 × 72 = 4536. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 29 = 493. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 477 + 129 = 606. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 960 + 917 = 1871. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 646 + 310 = 956. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 85 × 17 = 1446. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 35 × 79 = 2764. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 47 = 4372. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 236 + 178 = 421. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 713 + 749 = 1462. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 14 × 82 = 1148. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 723 + 741 = 1472. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 96 × 77 = 7386. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 61 × 45 = 2745. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 96 × 46 = 4416. Correct or wrong? (a) wrong (b) correct

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