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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 39 · 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. 1.72 × 4 =
  2. 2.22 × 4 =
  3. 3.18 × 8 =
  4. 4.26 × 8 =
  5. 5.19 × 8 =
  6. 6.30 × 4 =
  7. 7.28 × 8 =
  8. 8.21 × 8 =
  9. 9.38 × 8 =
  10. 10.30 × 8 =
  11. 11.37 × 4 =
  12. 12.61 × 4 =
  13. 13.41 × 4 =
  14. 14.33 × 4 =
  15. 15.48 × 4 =
  16. 16.15 × 8 =
  17. 17.56 × 4 =
  18. 18.24 × 8 =
  19. 19.21 × 4 =
  20. 20.16 × 4 =
  21. 21.46 × 4 =
  22. 22.35 × 8 =
  23. 23.39 × 8 =
  24. 24.17 × 8 =
  25. 25.16 × 8 =
  26. 26.14 × 4 =
  27. 27.69 × 4 =
  28. 28.50 × 4 =
  29. 29.33 × 8 =
  30. 30.22 × 8 =
  31. 31.65 × 4 =
  32. 32.20 × 8 =
  33. 33.44 × 4 =
  34. 34.36 × 8 =
  35. 35.35 × 4 =
  36. 36.18 × 4 =
  37. 37.66 × 4 =
  38. 38.55 × 4 =
  39. 39.52 × 4 =
  40. 40.40 × 8 =

Answer key

  1. 288
  2. 88
  3. 144
  4. 208
  5. 152
  6. 120
  7. 224
  8. 168
  9. 304
  10. 240
  11. 148
  12. 244
  13. 164
  14. 132
  15. 192
  16. 120
  17. 224
  18. 192
  19. 84
  20. 64
  21. 184
  22. 280
  23. 312
  24. 136
  25. 128
  26. 56
  27. 276
  28. 200
  29. 264
  30. 176
  31. 260
  32. 160
  33. 176
  34. 288
  35. 140
  36. 72
  37. 264
  38. 220
  39. 208
  40. 320

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