Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 302 · 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: 200 + 250 = 455. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 283 + 673 = 956. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 445 + 155 = 598. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 35 × 95 = 3330. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 958 + 587 = 1545. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 21 × 85 = 1785. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 50 × 82 = 4093. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 966 + 345 = 1311. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 54 × 85 = 4590. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 51 × 68 = 3466. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 829 + 483 = 1314. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 73 × 90 = 6570. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 719 + 252 = 972. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 247 + 739 = 990. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 46 × 35 = 1610. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 186 + 942 = 1128. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 864 + 844 = 1713. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 402 + 217 = 619. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 19 × 66 = 1254. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 612 + 415 = 1030. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 28 × 94 = 2634. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 67 × 71 = 4764. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 163 + 751 = 909. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 934 + 238 = 1172. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 44 × 52 = 2288. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 22 × 31 = 682. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 54 × 28 = 1512. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 58 × 26 = 1508. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 738 + 161 = 899. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 353 + 180 = 533. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 72 × 49 = 3528. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 374 + 938 = 1309. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 17 × 90 = 1530. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 629 + 392 = 1021. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 40 × 58 = 2322. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 301 + 751 = 1050. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 61 × 24 = 1464. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 60 × 16 = 966. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 39 × 31 = 1202. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 70 × 83 = 5810. Correct or wrong? (a) correct (b) wrong

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