Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 387 · 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: 564 + 615 = 1179. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 820 + 429 = 1246. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 880 + 678 = 1557. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 70 × 68 = 4760. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 56 × 80 = 4476. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 225 + 435 = 657. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 15 = 629. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 51 × 30 = 1523. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 98 × 99 = 9707. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 39 × 88 = 3439. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 41 = 866. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 201 + 176 = 383. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 40 × 92 = 3672. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 228 + 154 = 382. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 447 + 802 = 1249. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 14 × 94 = 1314. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 233 + 947 = 1180. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 315 + 896 = 1211. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 975 + 827 = 1795. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 717 + 606 = 1323. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 749 + 678 = 1428. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 46 × 58 = 2662. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 69 × 75 = 5171. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 607 + 235 = 842. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 44 × 85 = 3743. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 89 × 69 = 6135. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 238 + 408 = 646. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 38 × 46 = 1748. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 81 × 19 = 1537. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 27 × 47 = 1273. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 13 × 44 = 572. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 949 + 692 = 1644. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 269 + 918 = 1190. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 32 × 42 = 1338. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 33 × 18 = 601. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 236 + 832 = 1068. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 31 × 37 = 1147. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 692 + 148 = 840. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 199 + 575 = 774. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 983 + 620 = 1611. Correct or wrong? (a) correct (b) wrong

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