Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 913 · 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: 532 + 406 = 938. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 160 + 436 = 596. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 741 + 574 = 1318. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 16 × 58 = 928. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 61 × 91 = 5543. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 16 × 91 = 1456. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 74 × 74 = 5469. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 79 × 30 = 2369. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 932 + 869 = 1801. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 979 + 816 = 1795. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 78 × 48 = 3740. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 143 + 132 = 275. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 55 × 94 = 5170. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 93 × 43 = 4002. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 25 × 23 = 567. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 445 + 275 = 720. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 70 × 83 = 5815. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 16 × 88 = 1408. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 543 + 178 = 715. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 610 + 248 = 858. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 57 × 20 = 1140. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 700 + 596 = 1304. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 64 × 34 = 2176. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 31 × 50 = 1549. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 93 × 51 = 4751. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 12 × 79 = 951. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 59 × 77 = 4543. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 44 × 30 = 1318. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 27 × 46 = 1248. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 96 × 66 = 6336. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 641 + 188 = 824. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 235 + 276 = 504. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 331 + 953 = 1284. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 230 + 298 = 528. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 62 × 73 = 4519. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 707 + 516 = 1231. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 646 + 818 = 1464. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 53 × 42 = 2233. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 13 × 15 = 195. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 804 + 435 = 1240. Correct or wrong? (a) correct (b) wrong

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