Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 142 · 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: 151 + 950 = 1098. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 23 × 26 = 590. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 76 × 14 = 1067. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 93 × 49 = 4557. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 42 × 35 = 1470. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 245 + 368 = 613. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 319 + 257 = 575. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 539 + 601 = 1146. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 29 × 82 = 2381. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 66 × 65 = 4290. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 67 × 62 = 4155. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 14 × 55 = 770. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 519 + 312 = 831. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 19 × 22 = 423. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 422 + 217 = 639. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 141 + 295 = 435. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 43 × 99 = 4258. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 518 + 476 = 988. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 94 = 2731. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 154 + 310 = 457. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 137 + 421 = 554. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 64 × 21 = 1344. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 47 × 17 = 799. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 993 + 161 = 1154. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 47 × 59 = 2775. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 17 × 62 = 1056. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 14 × 66 = 924. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 996 + 636 = 1632. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 57 × 31 = 1767. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 365 + 126 = 491. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 624 + 201 = 825. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 604 + 444 = 1048. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 344 + 328 = 678. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 27 × 13 = 351. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 128 + 389 = 518. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 986 + 372 = 1357. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 15 × 16 = 240. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 31 × 63 = 1953. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 828 + 282 = 1114. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 611 + 566 = 1177. Correct or wrong? (a) wrong (b) correct

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