Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 201 · 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: 97 × 52 = 5044. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 287 + 324 = 611. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 59 × 41 = 2419. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 709 + 534 = 1243. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 798 + 718 = 1522. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 937 + 143 = 1079. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 30 × 31 = 925. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 747 + 296 = 1050. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 44 × 95 = 4181. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 66 × 86 = 5676. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 910 + 926 = 1836. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 40 = 1448. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 640 + 459 = 1106. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 298 + 181 = 479. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 15 × 12 = 180. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 271 + 837 = 1108. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 310 + 215 = 529. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 601 + 327 = 928. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 177 + 945 = 1114. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 53 × 67 = 3555. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 936 + 230 = 1166. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 897 + 469 = 1366. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 662 + 132 = 789. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 601 + 518 = 1119. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 40 × 24 = 964. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 30 × 76 = 2280. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 30 = 1320. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 16 × 32 = 519. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 911 + 646 = 1557. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 787 + 122 = 913. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 18 × 46 = 834. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 535 + 993 = 1528. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 806 + 602 = 1409. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 299 + 945 = 1244. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 34 × 12 = 408. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 526 + 637 = 1163. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 200 + 663 = 863. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 935 + 828 = 1763. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 600 + 606 = 1204. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 95 × 68 = 6467. Correct or wrong? (a) correct (b) wrong

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