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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 334 · 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. 1.42 × 4 =
  2. 2.27 × 8 =
  3. 3.40 × 4 =
  4. 4.18 × 8 =
  5. 5.71 × 4 =
  6. 6.32 × 4 =
  7. 7.58 × 4 =
  8. 8.70 × 4 =
  9. 9.75 × 4 =
  10. 10.57 × 4 =
  11. 11.39 × 4 =
  12. 12.41 × 4 =
  13. 13.49 × 4 =
  14. 14.38 × 4 =
  15. 15.35 × 8 =
  16. 16.17 × 8 =
  17. 17.20 × 8 =
  18. 18.59 × 4 =
  19. 19.13 × 4 =
  20. 20.21 × 4 =
  21. 21.72 × 4 =
  22. 22.19 × 4 =
  23. 23.29 × 8 =
  24. 24.16 × 4 =
  25. 25.56 × 4 =
  26. 26.24 × 8 =
  27. 27.67 × 4 =
  28. 28.31 × 8 =
  29. 29.43 × 4 =
  30. 30.14 × 8 =
  31. 31.29 × 4 =
  32. 32.40 × 8 =
  33. 33.12 × 4 =
  34. 34.13 × 8 =
  35. 35.32 × 8 =
  36. 36.36 × 8 =
  37. 37.33 × 8 =
  38. 38.31 × 4 =
  39. 39.60 × 4 =
  40. 40.63 × 4 =

Answer key

  1. 168
  2. 216
  3. 160
  4. 144
  5. 284
  6. 128
  7. 232
  8. 280
  9. 300
  10. 228
  11. 156
  12. 164
  13. 196
  14. 152
  15. 280
  16. 136
  17. 160
  18. 236
  19. 52
  20. 84
  21. 288
  22. 76
  23. 232
  24. 64
  25. 224
  26. 192
  27. 268
  28. 248
  29. 172
  30. 112
  31. 116
  32. 320
  33. 48
  34. 104
  35. 256
  36. 288
  37. 264
  38. 124
  39. 240
  40. 252

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