Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 114 · 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: 69 × 67 = 4623. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 771 + 251 = 1029. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 658 + 436 = 1094. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 97 × 30 = 2909. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 29 × 52 = 1508. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 959 + 322 = 1287. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 46 = 3450. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 252 + 905 = 1157. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 424 + 949 = 1370. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 433 + 668 = 1094. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 48 × 47 = 2260. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 753 + 875 = 1628. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 19 × 26 = 488. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 581 + 141 = 722. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 319 + 148 = 467. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 989 + 731 = 1720. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 551 + 413 = 968. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 17 × 97 = 1655. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 58 × 80 = 4641. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 338 + 124 = 462. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 36 × 60 = 2160. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 467 + 567 = 1042. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 34 × 56 = 1905. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 14 × 72 = 1008. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 421 + 851 = 1279. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 808 + 760 = 1568. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 267 + 799 = 1066. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 97 = 4656. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 701 + 307 = 1008. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 199 + 683 = 882. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 20 × 50 = 1000. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 53 = 2385. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 308 + 950 = 1258. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 18 = 1493. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 157 + 950 = 1102. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 24 × 97 = 2328. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 33 × 94 = 3102. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 14 × 97 = 1358. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 67 × 63 = 4221. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 613 + 292 = 905. Correct or wrong? (a) correct (b) wrong

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