Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 241 · 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: 62 × 63 = 3906. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 553 + 726 = 1278. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 877 + 159 = 1036. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 994 + 737 = 1731. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 52 × 96 = 4992. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 300 + 488 = 788. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 17 × 50 = 850. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 222 + 196 = 418. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 21 × 28 = 588. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 25 × 97 = 2425. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 51 × 97 = 4940. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 714 + 751 = 1465. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 69 × 97 = 6693. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 623 + 370 = 993. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 64 × 70 = 4480. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 396 + 731 = 1127. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 599 + 250 = 847. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 82 × 70 = 5744. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 828 + 508 = 1337. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 260 + 241 = 501. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 381 + 481 = 860. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 46 × 90 = 4134. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 91 = 1371. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 39 × 78 = 3036. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 262 + 710 = 966. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 370 + 911 = 1281. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 646 + 454 = 1100. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 34 × 78 = 2654. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 79 × 94 = 7426. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 38 × 28 = 1069. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 250 + 957 = 1207. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 94 × 92 = 8648. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 67 × 34 = 2278. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 33 × 80 = 2633. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 472 + 903 = 1375. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 287 + 299 = 591. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 74 = 6882. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 340 + 507 = 847. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 99 = 9610. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 73 × 51 = 3723. Correct or wrong? (a) correct (b) wrong

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