Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 313 · 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: 45 × 30 = 1350. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 35 × 40 = 1394. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 89 × 98 = 8720. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 38 × 63 = 2386. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 97 × 45 = 4365. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 245 + 656 = 901. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 41 × 77 = 3160. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 367 + 259 = 618. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 739 + 237 = 976. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 42 × 52 = 2179. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 47 × 78 = 3666. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 711 + 887 = 1598. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 335 + 688 = 1023. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 48 × 23 = 1109. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 69 × 17 = 1173. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 475 + 761 = 1236. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 330 + 159 = 491. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 73 × 27 = 1976. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 447 + 235 = 683. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 17 × 55 = 935. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 390 + 384 = 773. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 33 × 45 = 1485. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 29 × 20 = 581. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 589 + 690 = 1279. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 76 × 36 = 2744. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 720 + 966 = 1686. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 667 + 797 = 1470. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 14 × 25 = 347. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 196 + 336 = 532. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 37 × 43 = 1588. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 293 + 878 = 1171. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 487 + 872 = 1360. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 87 × 69 = 6011. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 12 × 50 = 600. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 792 + 796 = 1588. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 85 × 18 = 1538. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 23 × 88 = 2024. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 56 × 81 = 4536. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 50 = 4550. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 154 + 368 = 523. Correct or wrong? (a) wrong (b) correct

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