Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 418 · 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: 916 + 939 = 1855. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 636 + 966 = 1602. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 205 + 247 = 452. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 956 + 206 = 1162. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 83 × 43 = 3569. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 61 × 37 = 2257. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 92 × 99 = 9116. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 689 + 684 = 1380. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 29 × 97 = 2813. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 706 + 424 = 1138. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 20 × 57 = 1148. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 43 × 64 = 2754. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 78 × 97 = 7573. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 570 + 614 = 1184. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 14 = 1204. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 660 + 423 = 1083. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 125 + 678 = 803. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 773 + 697 = 1472. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 83 × 44 = 3650. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 470 + 725 = 1195. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 981 + 629 = 1608. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 54 = 702. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 712 + 732 = 1447. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 262 + 299 = 567. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 37 × 13 = 479. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 436 + 359 = 795. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 524 + 559 = 1081. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 618 + 376 = 999. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 600 + 405 = 1005. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 782 + 693 = 1470. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 901 + 715 = 1616. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 553 + 372 = 917. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 67 × 93 = 6228. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 687 + 666 = 1353. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 56 × 72 = 4032. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 78 × 89 = 6937. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 308 + 440 = 756. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 770 + 405 = 1175. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 233 + 141 = 369. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 276 + 135 = 416. Correct or wrong? (a) correct (b) wrong

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