Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 219 · 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: 32 × 25 = 800. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 360 + 694 = 1051. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 958 + 800 = 1757. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 35 × 16 = 560. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 84 = 1761. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 83 × 45 = 3736. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 549 + 718 = 1267. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 184 + 215 = 399. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 38 × 35 = 1330. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 869 + 621 = 1498. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 50 × 22 = 1100. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 52 × 31 = 1612. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 58 = 1152. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 64 = 3264. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 159 + 165 = 316. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 93 × 70 = 6515. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 24 × 44 = 1056. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 29 × 12 = 348. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 585 + 149 = 738. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 63 × 94 = 5922. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 29 × 84 = 2436. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 659 + 909 = 1573. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 29 × 56 = 1624. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 375 + 166 = 533. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 36 × 83 = 2988. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 936 + 357 = 1293. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 213 + 270 = 485. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 90 × 53 = 4770. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 93 × 58 = 5388. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 149 + 452 = 602. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 35 × 75 = 2623. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 991 + 377 = 1365. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 836 + 658 = 1494. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 23 × 63 = 1449. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 63 × 97 = 6111. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 80 = 5602. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 281 + 612 = 890. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 66 × 19 = 1254. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 90 × 14 = 1260. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 350 + 888 = 1238. Correct or wrong? (a) correct (b) wrong

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