Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 6 · 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: 85 × 78 = 6638. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 950 + 963 = 1910. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 423 + 358 = 779. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 82 × 32 = 2624. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 155 + 340 = 493. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 93 × 44 = 4096. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 32 × 61 = 1952. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 942 + 165 = 1107. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 46 × 13 = 598. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 212 + 133 = 341. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 82 × 69 = 5657. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 67 × 86 = 5762. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 346 + 400 = 746. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 780 + 295 = 1083. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 23 × 84 = 1939. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 50 × 33 = 1656. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 339 + 707 = 1039. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 20 × 56 = 1116. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 457 + 659 = 1120. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 79 × 13 = 1027. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 386 + 183 = 569. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 973 + 507 = 1482. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 27 × 90 = 2433. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 438 + 451 = 889. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 325 + 131 = 459. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 279 + 546 = 820. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 16 = 224. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 646 + 989 = 1641. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 26 × 64 = 1658. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 195 + 762 = 964. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 55 × 46 = 2530. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 579 + 197 = 784. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 87 × 83 = 7228. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 708 + 363 = 1068. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 353 + 285 = 638. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 942 + 593 = 1542. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 443 + 255 = 698. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 35 = 490. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 798 + 888 = 1692. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 39 × 16 = 624. Correct or wrong? (a) wrong (b) correct

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