Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 700 · 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: 648 + 601 = 1250. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 78 × 88 = 6866. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 45 × 36 = 1612. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 42 × 44 = 1848. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 59 × 36 = 2124. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 783 + 307 = 1090. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 359 + 628 = 987. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 75 = 2625. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 89 × 29 = 2579. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 76 × 70 = 5316. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 90 × 31 = 2788. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 62 × 46 = 2851. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 48 × 13 = 624. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 89 × 22 = 1958. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 66 × 62 = 4092. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 247 + 158 = 399. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 589 + 145 = 734. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 90 × 90 = 8097. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 671 + 394 = 1065. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 16 × 24 = 384. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 365 + 319 = 684. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 83 × 54 = 4488. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 93 × 15 = 1403. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 144 + 208 = 347. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 64 × 24 = 1536. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 301 + 660 = 961. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 51 × 25 = 1281. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 849 + 278 = 1120. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 27 × 86 = 2320. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 237 + 530 = 769. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 15 × 27 = 405. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 24 × 99 = 2378. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 169 + 299 = 467. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 177 + 194 = 364. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 878 + 968 = 1846. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 82 × 23 = 1887. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 488 + 373 = 864. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 59 × 22 = 1298. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 55 × 29 = 1595. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 87 × 36 = 3132. Correct or wrong? (a) wrong (b) correct

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