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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 420 · 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. 1.56 × 4 =
  2. 2.72 × 4 =
  3. 3.63 × 4 =
  4. 4.20 × 8 =
  5. 5.40 × 8 =
  6. 6.73 × 4 =
  7. 7.70 × 4 =
  8. 8.33 × 4 =
  9. 9.13 × 8 =
  10. 10.19 × 8 =
  11. 11.60 × 4 =
  12. 12.16 × 4 =
  13. 13.48 × 4 =
  14. 14.29 × 4 =
  15. 15.44 × 4 =
  16. 16.45 × 4 =
  17. 17.58 × 4 =
  18. 18.51 × 4 =
  19. 19.12 × 8 =
  20. 20.41 × 4 =
  21. 21.16 × 8 =
  22. 22.17 × 8 =
  23. 23.22 × 4 =
  24. 24.25 × 8 =
  25. 25.61 × 4 =
  26. 26.32 × 8 =
  27. 27.18 × 4 =
  28. 28.15 × 4 =
  29. 29.37 × 8 =
  30. 30.22 × 8 =
  31. 31.34 × 8 =
  32. 32.53 × 4 =
  33. 33.33 × 8 =
  34. 34.59 × 4 =
  35. 35.49 × 4 =
  36. 36.65 × 4 =
  37. 37.67 × 4 =
  38. 38.35 × 8 =
  39. 39.30 × 8 =
  40. 40.24 × 4 =

Answer key

  1. 224
  2. 288
  3. 252
  4. 160
  5. 320
  6. 292
  7. 280
  8. 132
  9. 104
  10. 152
  11. 240
  12. 64
  13. 192
  14. 116
  15. 176
  16. 180
  17. 232
  18. 204
  19. 96
  20. 164
  21. 128
  22. 136
  23. 88
  24. 200
  25. 244
  26. 256
  27. 72
  28. 60
  29. 296
  30. 176
  31. 272
  32. 212
  33. 264
  34. 236
  35. 196
  36. 260
  37. 268
  38. 280
  39. 240
  40. 96

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