Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 946 · 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: 49 × 50 = 2450. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 281 + 553 = 834. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 28 × 30 = 840. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 615 + 455 = 1074. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 12 × 52 = 630. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 68 × 37 = 2514. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 319 + 470 = 789. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 212 + 994 = 1214. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 922 + 325 = 1252. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 286 + 140 = 426. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 682 + 127 = 811. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 975 + 174 = 1141. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 773 + 805 = 1578. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 61 × 63 = 3846. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 18 × 25 = 450. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 54 × 43 = 2316. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 625 + 920 = 1551. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 86 × 32 = 2758. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 67 × 79 = 5293. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 81 × 18 = 1460. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 534 + 267 = 798. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 38 × 73 = 2776. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 94 × 23 = 2162. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 867 + 767 = 1629. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 94 × 69 = 6483. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 56 × 34 = 1898. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 562 + 346 = 911. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 716 + 953 = 1674. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 396 + 795 = 1191. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 384 + 888 = 1272. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 176 + 585 = 764. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 462 + 657 = 1119. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 50 × 92 = 4600. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 295 + 309 = 604. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 932 + 753 = 1685. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 355 + 676 = 1031. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 655 + 213 = 868. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 678 + 137 = 815. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 15 × 93 = 1395. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 219 + 217 = 436. Correct or wrong? (a) correct (b) wrong

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