Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 350 · 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: 75 × 32 = 2404. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 867 + 145 = 1013. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 24 × 40 = 957. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 80 × 91 = 7287. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 96 × 66 = 6343. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 21 × 36 = 756. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 43 × 47 = 2018. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 814 + 972 = 1786. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 77 × 18 = 1386. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 89 × 31 = 2759. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 67 × 80 = 5360. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 459 + 609 = 1068. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 37 × 77 = 2849. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 72 × 60 = 4313. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 273 + 388 = 661. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 72 × 25 = 1806. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 373 + 291 = 664. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 99 × 88 = 8710. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 497 + 951 = 1445. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 644 + 926 = 1577. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 96 × 47 = 4512. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 37 × 86 = 3175. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 446 + 691 = 1137. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 52 = 2340. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 71 = 1988. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 540 + 678 = 1211. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 28 × 53 = 1484. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 73 × 86 = 6279. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 59 × 94 = 5546. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 842 + 389 = 1232. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 19 × 76 = 1450. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 615 + 688 = 1309. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 24 × 54 = 1296. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 271 + 630 = 904. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 473 + 164 = 643. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 36 × 99 = 3566. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 884 + 972 = 1856. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 759 + 388 = 1147. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 199 + 291 = 490. Correct or wrong? (a) correct (b) wrong

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