Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 336 · 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: 42 × 59 = 2480. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 25 × 33 = 825. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 228 + 765 = 990. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 712 + 717 = 1429. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 384 + 366 = 752. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 16 × 48 = 774. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 67 × 58 = 3888. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 990 + 628 = 1618. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 23 × 37 = 851. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 755 + 192 = 947. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 31 × 72 = 2232. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 464 + 754 = 1218. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 779 + 342 = 1121. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 66 × 34 = 2251. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 510 + 714 = 1224. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 743 + 619 = 1357. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 866 + 649 = 1515. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 289 + 717 = 1002. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 878 + 353 = 1231. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 43 × 61 = 2618. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 888 + 484 = 1372. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 745 + 877 = 1622. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 855 + 204 = 1063. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 681 + 121 = 802. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 72 × 17 = 1224. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 18 × 53 = 954. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 503 + 229 = 725. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 239 + 142 = 374. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 616 + 363 = 981. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 992 + 408 = 1400. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 94 × 21 = 1974. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 559 + 157 = 717. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 630 + 434 = 1064. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 280 + 745 = 1025. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 98 × 27 = 2640. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 12 × 77 = 924. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 589 + 565 = 1154. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 54 × 75 = 4050. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 48 × 40 = 1928. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 967 + 715 = 1682. Correct or wrong? (a) correct (b) wrong

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