Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 320 · 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: 79 × 18 = 1422. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 42 × 54 = 2275. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 578 + 620 = 1192. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 267 + 803 = 1070. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 81 × 73 = 5914. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 352 + 233 = 585. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 20 × 93 = 1863. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 17 × 62 = 1054. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 440 + 861 = 1304. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 33 = 1056. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 69 × 98 = 6762. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 48 × 53 = 2551. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 73 × 20 = 1463. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 376 + 174 = 542. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 961 + 346 = 1307. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 945 + 596 = 1541. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 765 + 368 = 1126. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 50 × 55 = 2750. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 607 + 731 = 1338. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 203 + 996 = 1195. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 720 + 924 = 1644. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 749 + 352 = 1107. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 533 + 932 = 1465. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 263 + 254 = 523. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 35 × 15 = 526. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 342 + 500 = 842. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 61 × 43 = 2623. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 19 × 41 = 779. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 16 × 70 = 1120. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 297 + 487 = 787. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 676 + 270 = 938. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 56 × 40 = 2240. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 354 + 496 = 852. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 662 + 824 = 1491. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 288 + 425 = 713. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 139 + 979 = 1118. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 378 + 507 = 885. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 90 × 25 = 2254. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 20 × 56 = 1126. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 86 × 24 = 2064. Correct or wrong? (a) correct (b) wrong

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