Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 401 · 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: 788 + 452 = 1248. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 27 × 41 = 1107. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 259 + 419 = 685. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 52 × 62 = 3224. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 42 × 73 = 3066. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 17 × 31 = 529. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 70 × 50 = 3493. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 132 + 270 = 407. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 30 = 1197. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 37 × 85 = 3146. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 805 + 798 = 1603. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 38 × 60 = 2278. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 374 + 552 = 930. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 96 × 42 = 4025. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 23 × 61 = 1395. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 39 × 79 = 3075. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 22 × 77 = 1694. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 94 × 70 = 6580. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 62 × 45 = 2790. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 93 × 28 = 2608. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 38 × 12 = 456. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 83 × 89 = 7387. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 166 + 165 = 331. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 179 + 189 = 368. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 458 + 421 = 881. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 265 + 493 = 765. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 12 × 35 = 420. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 22 × 52 = 1137. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 18 × 74 = 1337. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 725 + 265 = 993. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 51 × 22 = 1122. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 36 × 62 = 2238. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 47 × 45 = 2115. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 832 + 145 = 979. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 24 = 814. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 598 + 437 = 1032. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 368 + 985 = 1360. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 875 + 614 = 1488. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 55 × 27 = 1488. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 53 × 31 = 1643. Correct or wrong? (a) wrong (b) correct

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