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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 649 · 40 questions
TalentJR

How to do it in your head (Double, double, double): × 2: double once. × 4: double, then double again. × 8: double three times.

NameDateTime takenScore ___ / 40
  1. 1.72 × 4 =
  2. 2.27 × 8 =
  3. 3.26 × 8 =
  4. 4.39 × 4 =
  5. 5.29 × 8 =
  6. 6.61 × 4 =
  7. 7.56 × 4 =
  8. 8.75 × 4 =
  9. 9.26 × 4 =
  10. 10.23 × 8 =
  11. 11.16 × 8 =
  12. 12.29 × 4 =
  13. 13.67 × 4 =
  14. 14.35 × 8 =
  15. 15.17 × 4 =
  16. 16.40 × 4 =
  17. 17.13 × 8 =
  18. 18.31 × 4 =
  19. 19.53 × 4 =
  20. 20.19 × 8 =
  21. 21.68 × 4 =
  22. 22.40 × 8 =
  23. 23.30 × 4 =
  24. 24.54 × 4 =
  25. 25.32 × 8 =
  26. 26.73 × 4 =
  27. 27.59 × 4 =
  28. 28.48 × 4 =
  29. 29.49 × 4 =
  30. 30.22 × 8 =
  31. 31.71 × 4 =
  32. 32.45 × 4 =
  33. 33.51 × 4 =
  34. 34.69 × 4 =
  35. 35.25 × 8 =
  36. 36.18 × 8 =
  37. 37.25 × 4 =
  38. 38.47 × 4 =
  39. 39.41 × 4 =
  40. 40.36 × 4 =

Answer key

  1. 288
  2. 216
  3. 208
  4. 156
  5. 232
  6. 244
  7. 224
  8. 300
  9. 104
  10. 184
  11. 128
  12. 116
  13. 268
  14. 280
  15. 68
  16. 160
  17. 104
  18. 124
  19. 212
  20. 152
  21. 272
  22. 320
  23. 120
  24. 216
  25. 256
  26. 292
  27. 236
  28. 192
  29. 196
  30. 176
  31. 284
  32. 180
  33. 204
  34. 276
  35. 200
  36. 144
  37. 100
  38. 188
  39. 164
  40. 144

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