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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 445 · 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. 1.23 × 4 =
  2. 2.13 × 8 =
  3. 3.12 × 8 =
  4. 4.21 × 8 =
  5. 5.36 × 4 =
  6. 6.31 × 8 =
  7. 7.26 × 4 =
  8. 8.31 × 4 =
  9. 9.12 × 4 =
  10. 10.13 × 4 =
  11. 11.37 × 4 =
  12. 12.38 × 8 =
  13. 13.65 × 4 =
  14. 14.74 × 4 =
  15. 15.32 × 8 =
  16. 16.34 × 4 =
  17. 17.67 × 4 =
  18. 18.33 × 4 =
  19. 19.15 × 8 =
  20. 20.70 × 4 =
  21. 21.37 × 8 =
  22. 22.29 × 4 =
  23. 23.52 × 4 =
  24. 24.57 × 4 =
  25. 25.23 × 8 =
  26. 26.25 × 4 =
  27. 27.17 × 4 =
  28. 28.42 × 4 =
  29. 29.30 × 8 =
  30. 30.34 × 8 =
  31. 31.40 × 4 =
  32. 32.43 × 4 =
  33. 33.22 × 8 =
  34. 34.33 × 8 =
  35. 35.30 × 4 =
  36. 36.48 × 4 =
  37. 37.32 × 4 =
  38. 38.75 × 4 =
  39. 39.29 × 8 =
  40. 40.28 × 8 =

Answer key

  1. 92
  2. 104
  3. 96
  4. 168
  5. 144
  6. 248
  7. 104
  8. 124
  9. 48
  10. 52
  11. 148
  12. 304
  13. 260
  14. 296
  15. 256
  16. 136
  17. 268
  18. 132
  19. 120
  20. 280
  21. 296
  22. 116
  23. 208
  24. 228
  25. 184
  26. 100
  27. 68
  28. 168
  29. 240
  30. 272
  31. 160
  32. 172
  33. 176
  34. 264
  35. 120
  36. 192
  37. 128
  38. 300
  39. 232
  40. 224

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