Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 988 · 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: 97 × 45 = 4365. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 29 × 70 = 2030. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 633 + 490 = 1123. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 954 + 472 = 1425. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 82 = 3526. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 288 + 849 = 1137. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 580 + 205 = 788. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 96 × 20 = 1920. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 671 + 372 = 1041. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 17 × 34 = 578. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 918 + 707 = 1624. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 700 + 192 = 892. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 214 + 423 = 637. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 19 × 98 = 1870. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 400 + 933 = 1333. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 57 × 69 = 3935. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 14 × 23 = 322. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 513 + 157 = 670. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 797 + 450 = 1242. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 23 × 52 = 1196. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 66 × 80 = 5280. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 623 + 774 = 1397. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 65 × 93 = 6049. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 58 × 57 = 3312. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 23 = 916. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 65 × 87 = 5658. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 32 × 54 = 1733. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 41 = 3819. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 396 + 594 = 990. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 83 × 73 = 6059. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 298 + 359 = 651. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 820 + 716 = 1532. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 72 × 74 = 5328. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 73 × 34 = 2483. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 94 × 12 = 1126. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 73 = 5110. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 488 + 328 = 823. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 29 × 83 = 2407. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 800 + 678 = 1474. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 880 + 763 = 1645. Correct or wrong? (a) correct (b) wrong

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