Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 850 · 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: 692 + 718 = 1405. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 48 = 4368. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 51 × 33 = 1691. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 189 + 861 = 1050. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 501 + 199 = 699. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 313 + 259 = 572. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 27 = 2133. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 38 × 83 = 3151. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 820 + 243 = 1063. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 44 × 26 = 1143. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 27 × 90 = 2431. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 52 = 3956. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 67 × 87 = 5829. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 19 = 398. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 770 + 714 = 1476. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 13 × 34 = 442. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 33 × 95 = 3127. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 20 × 64 = 1280. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 87 × 66 = 5742. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 764 + 223 = 984. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 128 + 370 = 498. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 27 × 63 = 1701. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 257 + 949 = 1206. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 497 + 129 = 629. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 802 + 175 = 981. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 32 × 26 = 833. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 413 + 304 = 717. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 982 + 303 = 1289. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 16 × 16 = 257. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 53 × 77 = 4081. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 39 × 92 = 3588. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 806 + 594 = 1403. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 992 + 868 = 1860. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 12 × 21 = 252. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 43 × 74 = 3182. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 94 × 84 = 7896. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 456 + 450 = 906. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 783 + 718 = 1500. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 722 + 840 = 1565. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 17 × 85 = 1445. Correct or wrong? (a) wrong (b) correct

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