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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 758 · 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 43 =
  2. 2.Double 21 =
  3. 3.Double 54 =
  4. 4.Half of 184 =
  5. 5.Double 69 =
  6. 6.Half of 120 =
  7. 7.Half of 108 =
  8. 8.Half of 56 =
  9. 9.Half of 88 =
  10. 10.Double 52 =
  11. 11.Double 66 =
  12. 12.Half of 116 =
  13. 13.Half of 118 =
  14. 14.Half of 78 =
  15. 15.Double 36 =
  16. 16.Double 86 =
  17. 17.Half of 30 =
  18. 18.Double 73 =
  19. 19.Double 18 =
  20. 20.Half of 62 =
  21. 21.Double 41 =
  22. 22.Double 38 =
  23. 23.Half of 36 =
  24. 24.Half of 114 =
  25. 25.Half of 144 =
  26. 26.Double 58 =
  27. 27.Half of 74 =
  28. 28.Double 59 =
  29. 29.Double 37 =
  30. 30.Half of 48 =
  31. 31.Half of 168 =
  32. 32.Double 29 =
  33. 33.Half of 158 =
  34. 34.Double 17 =
  35. 35.Double 94 =
  36. 36.Half of 86 =
  37. 37.Half of 44 =
  38. 38.Double 28 =
  39. 39.Half of 76 =
  40. 40.Half of 50 =

Answer key

  1. 86
  2. 42
  3. 108
  4. 92
  5. 138
  6. 60
  7. 54
  8. 28
  9. 44
  10. 104
  11. 132
  12. 58
  13. 59
  14. 39
  15. 72
  16. 172
  17. 15
  18. 146
  19. 36
  20. 31
  21. 82
  22. 76
  23. 18
  24. 57
  25. 72
  26. 116
  27. 37
  28. 118
  29. 74
  30. 24
  31. 84
  32. 58
  33. 79
  34. 34
  35. 188
  36. 43
  37. 22
  38. 56
  39. 38
  40. 25

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