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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 693 · 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.Half of 54 =
  2. 2.Double 44 =
  3. 3.Double 61 =
  4. 4.Half of 146 =
  5. 5.Half of 40 =
  6. 6.Double 28 =
  7. 7.Half of 38 =
  8. 8.Double 66 =
  9. 9.Half of 94 =
  10. 10.Half of 64 =
  11. 11.Half of 178 =
  12. 12.Double 88 =
  13. 13.Double 34 =
  14. 14.Double 51 =
  15. 15.Double 19 =
  16. 16.Double 73 =
  17. 17.Double 82 =
  18. 18.Half of 102 =
  19. 19.Double 21 =
  20. 20.Half of 100 =
  21. 21.Half of 180 =
  22. 22.Double 59 =
  23. 23.Double 74 =
  24. 24.Double 94 =
  25. 25.Double 84 =
  26. 26.Half of 184 =
  27. 27.Double 18 =
  28. 28.Double 17 =
  29. 29.Double 41 =
  30. 30.Double 95 =
  31. 31.Double 32 =
  32. 32.Double 68 =
  33. 33.Double 45 =
  34. 34.Double 67 =
  35. 35.Half of 182 =
  36. 36.Half of 114 =
  37. 37.Double 33 =
  38. 38.Half of 62 =
  39. 39.Double 52 =
  40. 40.Half of 26 =

Answer key

  1. 27
  2. 88
  3. 122
  4. 73
  5. 20
  6. 56
  7. 19
  8. 132
  9. 47
  10. 32
  11. 89
  12. 176
  13. 68
  14. 102
  15. 38
  16. 146
  17. 164
  18. 51
  19. 42
  20. 50
  21. 90
  22. 118
  23. 148
  24. 188
  25. 168
  26. 92
  27. 36
  28. 34
  29. 82
  30. 190
  31. 64
  32. 136
  33. 90
  34. 134
  35. 91
  36. 57
  37. 66
  38. 31
  39. 104
  40. 13

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