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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 625 · 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. 1.55 × 4 =
  2. 2.39 × 8 =
  3. 3.34 × 8 =
  4. 4.30 × 8 =
  5. 5.33 × 8 =
  6. 6.37 × 8 =
  7. 7.59 × 4 =
  8. 8.30 × 4 =
  9. 9.23 × 8 =
  10. 10.51 × 4 =
  11. 11.19 × 8 =
  12. 12.12 × 4 =
  13. 13.35 × 4 =
  14. 14.14 × 4 =
  15. 15.13 × 8 =
  16. 16.48 × 4 =
  17. 17.28 × 8 =
  18. 18.16 × 8 =
  19. 19.65 × 4 =
  20. 20.67 × 4 =
  21. 21.12 × 8 =
  22. 22.75 × 4 =
  23. 23.17 × 4 =
  24. 24.25 × 8 =
  25. 25.15 × 8 =
  26. 26.74 × 4 =
  27. 27.66 × 4 =
  28. 28.14 × 8 =
  29. 29.61 × 4 =
  30. 30.35 × 8 =
  31. 31.54 × 4 =
  32. 32.53 × 4 =
  33. 33.37 × 4 =
  34. 34.49 × 4 =
  35. 35.60 × 4 =
  36. 36.16 × 4 =
  37. 37.44 × 4 =
  38. 38.36 × 4 =
  39. 39.50 × 4 =
  40. 40.32 × 8 =

Answer key

  1. 220
  2. 312
  3. 272
  4. 240
  5. 264
  6. 296
  7. 236
  8. 120
  9. 184
  10. 204
  11. 152
  12. 48
  13. 140
  14. 56
  15. 104
  16. 192
  17. 224
  18. 128
  19. 260
  20. 268
  21. 96
  22. 300
  23. 68
  24. 200
  25. 120
  26. 296
  27. 264
  28. 112
  29. 244
  30. 280
  31. 216
  32. 212
  33. 148
  34. 196
  35. 240
  36. 64
  37. 176
  38. 144
  39. 200
  40. 256

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