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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 742 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 64 =
  2. 2.Double 56 =
  3. 3.Double 61 =
  4. 4.Double 67 =
  5. 5.Double 46 =
  6. 6.Double 32 =
  7. 7.Half of 184 =
  8. 8.Double 96 =
  9. 9.Half of 34 =
  10. 10.Double 45 =
  11. 11.Double 39 =
  12. 12.Half of 94 =
  13. 13.Double 95 =
  14. 14.Half of 150 =
  15. 15.Double 16 =
  16. 16.Half of 158 =
  17. 17.Double 35 =
  18. 18.Double 97 =
  19. 19.Half of 76 =
  20. 20.Half of 92 =
  21. 21.Double 51 =
  22. 22.Double 29 =
  23. 23.Half of 168 =
  24. 24.Half of 32 =
  25. 25.Half of 146 =
  26. 26.Double 34 =
  27. 27.Double 75 =
  28. 28.Double 38 =
  29. 29.Half of 132 =
  30. 30.Half of 54 =
  31. 31.Half of 176 =
  32. 32.Double 25 =
  33. 33.Double 66 =
  34. 34.Half of 36 =
  35. 35.Double 52 =
  36. 36.Double 42 =
  37. 37.Double 26 =
  38. 38.Half of 112 =
  39. 39.Half of 172 =
  40. 40.Double 78 =

Answer key

  1. 128
  2. 112
  3. 122
  4. 134
  5. 92
  6. 64
  7. 92
  8. 192
  9. 17
  10. 90
  11. 78
  12. 47
  13. 190
  14. 75
  15. 32
  16. 79
  17. 70
  18. 194
  19. 38
  20. 46
  21. 102
  22. 58
  23. 84
  24. 16
  25. 73
  26. 68
  27. 150
  28. 76
  29. 66
  30. 27
  31. 88
  32. 50
  33. 132
  34. 18
  35. 104
  36. 84
  37. 52
  38. 56
  39. 86
  40. 156

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