Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 884 · 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: 67 × 85 = 5695. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 252 + 207 = 460. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 451 + 760 = 1211. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 57 × 19 = 1089. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 21 × 30 = 630. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 882 + 634 = 1516. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 83 × 47 = 3903. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 493 + 125 = 617. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 755 + 691 = 1446. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 242 + 847 = 1089. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 42 = 881. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 54 × 84 = 4528. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 802 + 420 = 1219. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 44 × 61 = 2682. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 978 + 464 = 1442. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 84 × 14 = 1175. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 472 + 606 = 1078. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 680 + 645 = 1325. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 98 × 16 = 1568. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 75 × 96 = 7195. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 21 × 47 = 987. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 740 + 803 = 1543. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 26 = 518. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 160 + 360 = 520. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 223 + 920 = 1143. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 75 × 49 = 3667. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 965 + 292 = 1257. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 145 + 919 = 1064. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 70 = 2310. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 87 × 53 = 4605. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 138 + 861 = 1003. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 358 + 174 = 532. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 22 × 34 = 748. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 33 × 83 = 2739. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 147 + 431 = 578. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 283 + 143 = 427. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 719 + 684 = 1400. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 840 + 868 = 1700. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 901 + 250 = 1151. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 65 × 92 = 5980. Correct or wrong? (a) correct (b) wrong

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