Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 390 · 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: 88 × 37 = 3248. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 197 + 153 = 350. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 220 + 179 = 397. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 293 + 501 = 794. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 42 = 1806. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 630 + 506 = 1134. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 56 × 55 = 3076. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 86 × 62 = 5340. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 96 × 77 = 7392. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 67 × 29 = 1943. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 90 = 7650. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 52 × 31 = 1618. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 659 + 229 = 888. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 447 + 890 = 1337. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 75 × 12 = 901. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 205 + 500 = 705. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 64 × 42 = 2685. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 63 × 67 = 4215. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 216 + 575 = 792. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 85 × 92 = 7820. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 807 + 703 = 1502. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 833 + 936 = 1769. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 417 + 902 = 1319. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 948 + 909 = 1851. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 36 × 68 = 2444. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 465 + 943 = 1408. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 380 + 734 = 1114. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 309 + 823 = 1132. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 42 × 34 = 1428. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 148 + 368 = 516. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 18 × 80 = 1438. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 32 × 21 = 680. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 24 × 32 = 768. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 267 + 146 = 413. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 56 × 25 = 1397. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 377 + 153 = 522. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 726 + 579 = 1302. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 58 × 23 = 1334. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 523 + 824 = 1354. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 83 = 4482. Correct or wrong? (a) correct (b) wrong

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