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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 503 · 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. 2.75 × 4 =
  3. 3.12 × 4 =
  4. 4.39 × 8 =
  5. 5.14 × 8 =
  6. 6.33 × 4 =
  7. 7.47 × 4 =
  8. 8.37 × 4 =
  9. 9.23 × 8 =
  10. 10.28 × 8 =
  11. 11.25 × 4 =
  12. 12.37 × 8 =
  13. 13.30 × 4 =
  14. 14.35 × 8 =
  15. 15.17 × 8 =
  16. 16.71 × 4 =
  17. 17.19 × 8 =
  18. 18.69 × 4 =
  19. 19.29 × 4 =
  20. 20.26 × 4 =
  21. 21.20 × 8 =
  22. 22.67 × 4 =
  23. 23.31 × 4 =
  24. 24.34 × 8 =
  25. 25.49 × 4 =
  26. 26.35 × 4 =
  27. 27.63 × 4 =
  28. 28.34 × 4 =
  29. 29.14 × 4 =
  30. 30.24 × 8 =
  31. 31.21 × 8 =
  32. 32.12 × 8 =
  33. 33.27 × 8 =
  34. 34.28 × 4 =
  35. 35.15 × 4 =
  36. 36.16 × 8 =
  37. 37.33 × 8 =
  38. 38.26 × 8 =
  39. 39.57 × 4 =
  40. 40.22 × 8 =

Answer key

  1. 168
  2. 300
  3. 48
  4. 312
  5. 112
  6. 132
  7. 188
  8. 148
  9. 184
  10. 224
  11. 100
  12. 296
  13. 120
  14. 280
  15. 136
  16. 284
  17. 152
  18. 276
  19. 116
  20. 104
  21. 160
  22. 268
  23. 124
  24. 272
  25. 196
  26. 140
  27. 252
  28. 136
  29. 56
  30. 192
  31. 168
  32. 96
  33. 216
  34. 112
  35. 60
  36. 128
  37. 264
  38. 208
  39. 228
  40. 176

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