Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 821 · 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: 26 × 23 = 598. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 36 × 60 = 2160. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 902 + 194 = 1093. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 312 + 121 = 433. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 74 = 4960. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 51 = 3159. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 67 × 21 = 1407. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 13 × 35 = 461. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 288 + 816 = 1103. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 67 × 19 = 1272. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 90 = 7650. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 620 + 890 = 1502. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 52 × 42 = 2182. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 43 × 22 = 946. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 76 × 53 = 4026. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 52 × 79 = 4108. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 49 × 56 = 2744. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 76 × 42 = 3192. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 140 + 766 = 913. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 315 + 153 = 468. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 12 × 33 = 396. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 55 × 15 = 825. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 529 + 557 = 1085. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 58 × 40 = 2317. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 470 + 595 = 1065. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 77 × 14 = 1078. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 330 + 447 = 777. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 925 + 589 = 1514. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 38 × 75 = 2854. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 257 + 451 = 708. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 312 + 988 = 1307. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 176 + 999 = 1175. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 93 × 27 = 2519. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 39 × 98 = 3821. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 804 + 402 = 1209. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 25 × 30 = 750. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 724 + 858 = 1582. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 62 × 89 = 5518. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 58 × 35 = 2030. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 34 × 32 = 1093. Correct or wrong? (a) correct (b) wrong

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