Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 792 · 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: 37 × 77 = 2850. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 80 × 55 = 4404. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 35 × 46 = 1610. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 138 + 280 = 418. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 48 × 61 = 2928. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 36 × 61 = 2196. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 99 × 19 = 1879. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 325 + 206 = 531. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 290 + 353 = 636. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 359 + 290 = 649. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 97 × 73 = 7084. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 39 = 3002. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 56 × 43 = 2408. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 91 × 37 = 3367. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 61 × 34 = 2074. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 91 × 93 = 8463. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 40 × 38 = 1524. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 676 + 390 = 1066. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 61 × 16 = 972. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 728 + 221 = 956. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 413 + 156 = 569. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 47 × 30 = 1409. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 299 + 770 = 1067. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 18 × 19 = 342. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 314 + 532 = 846. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 36 × 98 = 3528. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 68 = 5918. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 186 + 856 = 1044. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 674 + 301 = 975. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 13 = 1170. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 909 + 549 = 1458. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 34 × 86 = 2924. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 24 × 19 = 456. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 850 + 252 = 1102. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 45 × 98 = 4410. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 646 + 175 = 821. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 612 + 173 = 793. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 16 × 85 = 1355. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 73 × 12 = 871. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 22 × 65 = 1426. Correct or wrong? (a) wrong (b) correct

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