Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 992 · 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: 602 + 264 = 874. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 569 + 167 = 737. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 887 + 298 = 1181. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 50 × 49 = 2445. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 472 + 130 = 604. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 96 × 43 = 4128. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 921 + 918 = 1839. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 201 + 293 = 494. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 910 + 993 = 1903. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 59 × 35 = 2062. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 954 + 968 = 1918. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 99 × 85 = 8408. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 753 + 440 = 1191. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 995 + 529 = 1524. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 88 = 4666. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 21 × 91 = 1911. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 985 + 575 = 1554. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 38 × 56 = 2128. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 34 × 63 = 2148. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 68 × 14 = 945. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 19 × 38 = 722. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 269 + 829 = 1098. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 18 × 55 = 989. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 57 × 87 = 4961. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 162 + 269 = 428. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 871 + 608 = 1479. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 47 × 45 = 2113. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 40 × 21 = 840. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 41 × 75 = 3078. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 226 + 674 = 906. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 70 × 26 = 1820. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 552 + 191 = 743. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 670 + 980 = 1648. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 637 + 212 = 849. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 529 + 541 = 1070. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 82 × 72 = 5904. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 384 + 926 = 1309. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 37 × 44 = 1628. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 93 × 43 = 4001. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 145 + 614 = 767. Correct or wrong? (a) wrong (b) correct

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