Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 484 · 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: 57 × 38 = 2170. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 19 × 86 = 1640. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 24 × 76 = 1825. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 670 + 162 = 840. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 28 × 33 = 931. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 798 + 288 = 1091. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 57 × 96 = 5472. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 21 × 29 = 609. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 164 + 559 = 724. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 18 × 19 = 342. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 25 × 78 = 1950. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 70 × 92 = 6440. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 16 × 61 = 976. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 786 + 954 = 1738. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 420 + 154 = 569. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 29 × 44 = 1276. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 52 × 37 = 1924. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 35 × 88 = 3080. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 24 × 57 = 1372. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 61 × 18 = 1103. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 40 × 15 = 600. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 90 × 61 = 5493. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 33 × 72 = 2376. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 15 × 98 = 1477. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 927 + 199 = 1134. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 21 × 18 = 378. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 276 + 292 = 570. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 18 × 31 = 558. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 745 + 288 = 1040. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 301 + 441 = 746. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 79 = 6485. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 79 × 51 = 4028. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 93 × 71 = 6601. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 41 = 3737. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 365 + 201 = 558. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 145 + 893 = 1038. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 616 + 421 = 1037. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 49 × 64 = 3140. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 228 + 600 = 828. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 641 + 942 = 1583. Correct or wrong? (a) correct (b) wrong

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