Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 954 · 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: 278 + 741 = 1015. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 38 = 569. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 35 × 23 = 808. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 35 × 89 = 3115. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 48 × 80 = 3840. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 29 × 14 = 405. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 71 × 77 = 5467. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 89 × 86 = 7654. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 57 × 74 = 4218. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 54 × 52 = 2811. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 22 × 59 = 1298. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 21 × 16 = 336. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 88 × 16 = 1401. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 375 + 373 = 748. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 436 + 783 = 1219. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 37 × 40 = 1480. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 69 × 83 = 5729. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 482 + 709 = 1191. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 80 × 96 = 7685. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 273 + 152 = 421. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 732 + 123 = 855. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 43 × 52 = 2236. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 205 + 422 = 624. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 37 × 16 = 588. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 962 + 924 = 1879. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 57 × 17 = 969. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 367 + 122 = 489. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 506 + 849 = 1355. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 556 + 405 = 961. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 86 × 44 = 3786. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 64 × 23 = 1465. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 25 × 20 = 500. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 20 × 62 = 1240. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 221 + 920 = 1141. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 821 + 740 = 1556. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 50 × 39 = 1950. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 299 + 766 = 1072. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 27 × 33 = 898. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 323 + 933 = 1256. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 75 × 34 = 2542. Correct or wrong? (a) wrong (b) correct

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