Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 676 · 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: 53 × 34 = 1804. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 81 = 7371. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 64 × 55 = 3520. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 27 × 70 = 1892. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 61 × 57 = 3474. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 33 × 88 = 2904. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 955 + 239 = 1198. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 278 + 668 = 946. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 289 + 857 = 1146. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 845 + 449 = 1294. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 310 + 874 = 1176. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 717 + 159 = 880. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 67 × 63 = 4221. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 99 × 57 = 5646. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 214 + 991 = 1205. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 324 + 277 = 601. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 507 + 594 = 1101. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 453 + 275 = 734. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 72 × 62 = 4464. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 137 + 254 = 391. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 753 + 550 = 1298. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 591 + 511 = 1099. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 884 + 291 = 1176. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 929 + 609 = 1533. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 157 + 293 = 447. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 67 × 35 = 2345. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 78 × 54 = 4212. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 86 = 7994. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 61 × 54 = 3295. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 369 + 976 = 1338. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 30 × 34 = 1020. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 49 = 931. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 361 + 196 = 559. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 32 × 80 = 2560. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 556 + 905 = 1466. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 56 × 91 = 5096. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 51 × 30 = 1530. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 13 = 1226. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 96 × 84 = 8064. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 84 × 12 = 1008. Correct or wrong? (a) correct (b) wrong

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