Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 878 · 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: 33 × 34 = 1114. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 719 + 416 = 1142. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 482 + 732 = 1220. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 49 × 38 = 1859. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 28 × 22 = 622. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 591 + 178 = 774. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 356 + 341 = 697. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 68 × 49 = 3328. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 32 × 45 = 1447. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 68 × 46 = 3132. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 19 = 437. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 921 + 229 = 1150. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 30 × 26 = 779. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 952 + 208 = 1160. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 46 = 1480. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 886 + 496 = 1382. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 686 + 322 = 1008. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 916 + 642 = 1558. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 625 + 511 = 1136. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 998 + 153 = 1153. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 329 + 246 = 575. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 39 × 65 = 2535. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 750 + 864 = 1618. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 507 + 173 = 680. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 538 + 378 = 916. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 989 + 572 = 1555. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 34 = 913. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 753 + 788 = 1541. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 191 + 123 = 308. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 91 × 79 = 7189. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 22 × 96 = 2109. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 202 + 757 = 953. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 642 + 996 = 1644. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 617 + 889 = 1506. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 89 × 20 = 1777. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 475 + 928 = 1405. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 249 + 267 = 509. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 238 + 134 = 371. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 56 × 38 = 2128. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 164 + 784 = 952. Correct or wrong? (a) wrong (b) correct

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