Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 548 · 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: 295 + 197 = 486. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 148 + 370 = 518. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 262 + 362 = 624. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 224 + 991 = 1215. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 806 + 788 = 1598. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 842 + 722 = 1564. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 17 = 1108. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 660 + 954 = 1614. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 890 + 260 = 1150. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 58 = 1621. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 36 × 85 = 3055. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 14 × 29 = 400. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 47 × 75 = 3525. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 318 + 556 = 870. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 941 + 382 = 1328. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 69 × 25 = 1725. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 36 × 23 = 828. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 571 + 549 = 1120. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 177 + 185 = 362. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 21 × 95 = 1995. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 716 + 217 = 933. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 304 + 780 = 1085. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 509 + 973 = 1483. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 840 + 699 = 1546. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 36 × 40 = 1440. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 748 + 670 = 1418. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 278 + 780 = 1063. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 77 × 18 = 1386. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 16 × 29 = 464. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 23 × 27 = 621. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 80 × 16 = 1274. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 390 + 960 = 1348. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 65 × 81 = 5265. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 22 × 90 = 1980. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 57 × 68 = 3876. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 970 + 950 = 1918. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 42 × 33 = 1386. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 94 × 16 = 1504. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 53 × 61 = 3237. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 620 + 930 = 1550. Correct or wrong? (a) correct (b) wrong

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