Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 472 · 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: 415 + 887 = 1302. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 188 + 586 = 776. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 543 + 266 = 809. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 770 + 714 = 1481. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 51 × 53 = 2709. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 632 + 459 = 1091. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 90 × 64 = 5765. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 515 + 170 = 685. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 82 × 25 = 2057. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 89 × 18 = 1602. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 601 + 386 = 987. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 420 + 343 = 765. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 77 × 40 = 3076. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 997 + 435 = 1426. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 54 × 48 = 2591. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 26 × 86 = 2236. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 41 × 93 = 3816. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 815 + 343 = 1162. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 409 + 647 = 1059. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 704 + 736 = 1435. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 691 + 332 = 1027. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 78 × 40 = 3114. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 330 + 263 = 593. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 468 + 316 = 786. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 738 + 166 = 899. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 218 + 288 = 511. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 793 + 951 = 1747. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 53 × 92 = 4876. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 58 × 41 = 2378. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 552 + 454 = 1006. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 36 × 13 = 468. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 80 × 95 = 7599. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 604 + 181 = 785. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 72 = 1296. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 92 × 60 = 5520. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 602 + 658 = 1266. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 40 × 94 = 3768. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 605 + 312 = 917. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 74 × 35 = 2590. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 803 + 947 = 1750. Correct or wrong? (a) wrong (b) correct

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