Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 308 · 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: 384 + 173 = 557. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 295 + 712 = 1005. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 409 + 253 = 662. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 27 × 13 = 351. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 56 × 87 = 4872. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 557 + 701 = 1257. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 14 × 41 = 574. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 93 = 3906. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 492 + 874 = 1366. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 94 × 90 = 8460. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 22 × 45 = 990. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 41 × 70 = 2870. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 15 × 87 = 1305. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 26 = 442. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 43 × 98 = 4214. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 37 × 31 = 1145. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 48 × 55 = 2640. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 228 + 326 = 553. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 427 + 131 = 564. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 433 + 472 = 905. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 536 + 535 = 1071. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 973 + 535 = 1508. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 462 + 384 = 842. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 97 × 26 = 2522. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 205 + 628 = 833. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 34 × 12 = 408. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 86 × 42 = 3615. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 786 + 300 = 1086. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 788 + 330 = 1118. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 807 + 848 = 1654. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 713 + 292 = 1005. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 75 × 77 = 5775. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 254 + 174 = 428. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 383 + 670 = 1053. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 270 + 140 = 410. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 263 + 781 = 1044. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 453 + 187 = 640. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 67 × 79 = 5293. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 27 × 97 = 2617. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 25 × 39 = 975. Correct or wrong? (a) correct (b) wrong

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