Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 845 · 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: 144 + 646 = 790. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 618 + 832 = 1458. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 385 + 934 = 1319. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 552 + 890 = 1442. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 228 + 424 = 652. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 438 + 425 = 870. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 922 + 281 = 1203. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 38 × 59 = 2242. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 94 × 59 = 5546. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 197 + 205 = 395. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 84 × 94 = 7894. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 682 + 851 = 1537. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 95 × 53 = 5038. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 934 + 155 = 1089. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 52 = 2756. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 686 + 771 = 1457. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 82 × 82 = 6726. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 565 + 942 = 1507. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 78 × 41 = 3196. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 649 + 296 = 945. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 85 × 49 = 4168. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 364 + 521 = 885. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 93 = 4557. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 802 + 575 = 1377. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 696 + 877 = 1573. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 760 + 617 = 1377. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 643 + 613 = 1256. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 145 + 577 = 714. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 786 + 750 = 1543. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 39 × 45 = 1753. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 44 × 32 = 1408. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 18 × 71 = 1278. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 391 + 361 = 750. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 61 × 48 = 2933. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 199 + 916 = 1115. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 485 + 233 = 718. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 361 + 181 = 544. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 187 + 683 = 870. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 60 × 69 = 4140. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 506 + 421 = 928. Correct or wrong? (a) correct (b) wrong

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