Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 638 · 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: 786 + 308 = 1090. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 92 = 5980. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 879 + 893 = 1772. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 76 × 39 = 2959. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 734 + 482 = 1216. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 685 + 516 = 1195. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 593 + 299 = 889. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 933 + 637 = 1570. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 383 + 249 = 632. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 994 + 721 = 1715. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 46 × 66 = 3036. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 87 × 59 = 5137. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 30 × 38 = 1146. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 128 + 257 = 385. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 767 + 714 = 1481. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 34 = 3166. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 743 + 161 = 900. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 727 + 407 = 1134. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 29 × 40 = 1160. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 37 × 18 = 666. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 939 + 352 = 1295. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 88 × 71 = 6256. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 27 × 26 = 698. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 263 + 511 = 774. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 850 + 570 = 1419. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 73 × 18 = 1319. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 91 × 55 = 5005. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 42 × 39 = 1638. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 19 × 28 = 529. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 99 × 29 = 2871. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 910 + 610 = 1516. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 973 + 420 = 1388. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 597 + 236 = 833. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 598 + 206 = 801. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 810 + 559 = 1362. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 428 + 765 = 1193. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 25 × 12 = 300. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 967 + 962 = 1929. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 62 × 19 = 1183. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 586 + 496 = 1082. Correct or wrong? (a) wrong (b) correct

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