Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 487 · 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: 15 × 79 = 1185. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 36 × 69 = 2484. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 38 = 1064. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 69 × 16 = 1104. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 85 × 12 = 1020. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 35 × 17 = 595. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 361 + 147 = 500. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 50 × 70 = 3492. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 142 + 228 = 362. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 61 × 74 = 4514. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 24 = 2042. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 164 + 434 = 598. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 92 × 17 = 1570. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 589 + 358 = 948. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 34 × 67 = 2276. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 35 × 27 = 946. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 174 + 284 = 466. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 21 × 50 = 1057. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 877 + 535 = 1405. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 229 + 225 = 462. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 53 × 14 = 739. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 932 + 983 = 1915. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 95 = 1235. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 669 + 227 = 897. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 93 × 88 = 8184. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 38 × 88 = 3344. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 355 + 782 = 1141. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 79 × 17 = 1349. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 21 × 66 = 1390. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 367 + 468 = 835. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 42 × 18 = 756. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 55 = 1815. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 53 × 80 = 4248. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 386 + 969 = 1354. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 979 + 306 = 1285. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 13 × 93 = 1209. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 978 + 212 = 1188. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 52 × 57 = 2964. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 80 × 40 = 3200. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 34 × 74 = 2516. Correct or wrong? (a) wrong (b) correct

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