Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 123 · 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: 85 × 44 = 3739. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 37 × 81 = 2997. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 29 × 92 = 2671. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 854 + 326 = 1180. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 244 + 365 = 610. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 56 × 43 = 2408. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 50 × 71 = 3550. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 50 × 92 = 4607. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 89 × 82 = 7298. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 488 + 989 = 1477. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 310 + 856 = 1170. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 24 × 42 = 1008. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 635 + 519 = 1154. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 332 + 195 = 523. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 36 × 78 = 2808. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 919 + 828 = 1748. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 82 × 13 = 1061. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 14 × 93 = 1307. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 908 + 388 = 1295. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 290 + 174 = 464. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 842 + 493 = 1335. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 68 × 87 = 5910. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 36 × 24 = 864. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 89 × 18 = 1598. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 69 × 27 = 1866. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 413 + 190 = 602. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 90 × 42 = 3780. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 91 × 65 = 5915. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 13 × 45 = 580. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 901 + 128 = 1029. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 245 + 120 = 365. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 59 × 12 = 713. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 58 × 65 = 3770. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 510 + 343 = 848. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 592 + 550 = 1142. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 28 × 28 = 784. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 40 × 50 = 2004. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 61 × 74 = 4514. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 390 + 452 = 850. Correct or wrong? (a) wrong (b) correct

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