Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 917 · 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: 93 × 33 = 3069. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 971 + 497 = 1468. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 51 × 62 = 3162. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 49 = 924. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 92 = 1656. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 37 × 65 = 2405. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 80 × 87 = 6960. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 36 × 54 = 1950. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 81 × 61 = 4933. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 590 + 841 = 1431. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 921 + 883 = 1804. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 74 × 29 = 2146. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 56 × 57 = 3192. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 905 + 603 = 1501. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 99 × 82 = 8111. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 528 + 258 = 784. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 552 + 686 = 1238. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 52 × 98 = 5096. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 519 + 368 = 880. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 89 × 55 = 4895. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 25 × 43 = 1074. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 68 × 45 = 3060. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 90 × 44 = 3960. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 537 + 402 = 939. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 426 + 301 = 735. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 216 + 291 = 513. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 580 + 303 = 879. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 87 × 90 = 7830. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 586 + 622 = 1208. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 384 + 161 = 545. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 269 + 504 = 768. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 31 × 59 = 1833. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 16 × 17 = 273. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 340 + 559 = 899. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 32 × 29 = 928. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 99 × 90 = 8910. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 908 + 826 = 1734. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 16 = 1510. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 705 + 954 = 1665. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 345 + 749 = 1089. Correct or wrong? (a) correct (b) wrong

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