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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 547 · 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. 1.36 × 4 =
  2. 2.29 × 8 =
  3. 3.40 × 8 =
  4. 4.39 × 8 =
  5. 5.19 × 8 =
  6. 6.72 × 4 =
  7. 7.25 × 8 =
  8. 8.35 × 8 =
  9. 9.68 × 4 =
  10. 10.56 × 4 =
  11. 11.23 × 8 =
  12. 12.14 × 4 =
  13. 13.27 × 8 =
  14. 14.47 × 4 =
  15. 15.26 × 4 =
  16. 16.57 × 4 =
  17. 17.52 × 4 =
  18. 18.37 × 8 =
  19. 19.48 × 4 =
  20. 20.16 × 4 =
  21. 21.33 × 4 =
  22. 22.53 × 4 =
  23. 23.54 × 4 =
  24. 24.30 × 4 =
  25. 25.16 × 8 =
  26. 26.24 × 8 =
  27. 27.38 × 8 =
  28. 28.28 × 4 =
  29. 29.43 × 4 =
  30. 30.17 × 8 =
  31. 31.45 × 4 =
  32. 32.66 × 4 =
  33. 33.34 × 8 =
  34. 34.18 × 8 =
  35. 35.23 × 4 =
  36. 36.15 × 8 =
  37. 37.20 × 8 =
  38. 38.71 × 4 =
  39. 39.55 × 4 =
  40. 40.36 × 8 =

Answer key

  1. 144
  2. 232
  3. 320
  4. 312
  5. 152
  6. 288
  7. 200
  8. 280
  9. 272
  10. 224
  11. 184
  12. 56
  13. 216
  14. 188
  15. 104
  16. 228
  17. 208
  18. 296
  19. 192
  20. 64
  21. 132
  22. 212
  23. 216
  24. 120
  25. 128
  26. 192
  27. 304
  28. 112
  29. 172
  30. 136
  31. 180
  32. 264
  33. 272
  34. 144
  35. 92
  36. 120
  37. 160
  38. 284
  39. 220
  40. 288

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