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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 457 · 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 158 =
  2. 2.Double 32 =
  3. 3.Double 44 =
  4. 4.Half of 180 =
  5. 5.Double 46 =
  6. 6.Half of 72 =
  7. 7.Half of 142 =
  8. 8.Half of 186 =
  9. 9.Double 53 =
  10. 10.Double 58 =
  11. 11.Half of 46 =
  12. 12.Half of 56 =
  13. 13.Double 31 =
  14. 14.Double 81 =
  15. 15.Double 74 =
  16. 16.Double 88 =
  17. 17.Half of 188 =
  18. 18.Double 93 =
  19. 19.Half of 182 =
  20. 20.Half of 144 =
  21. 21.Half of 196 =
  22. 22.Double 94 =
  23. 23.Half of 112 =
  24. 24.Double 57 =
  25. 25.Double 96 =
  26. 26.Double 24 =
  27. 27.Double 18 =
  28. 28.Double 43 =
  29. 29.Double 37 =
  30. 30.Half of 78 =
  31. 31.Half of 174 =
  32. 32.Half of 88 =
  33. 33.Half of 70 =
  34. 34.Half of 150 =
  35. 35.Double 49 =
  36. 36.Half of 50 =
  37. 37.Double 92 =
  38. 38.Half of 26 =
  39. 39.Double 19 =
  40. 40.Half of 34 =

Answer key

  1. 79
  2. 64
  3. 88
  4. 90
  5. 92
  6. 36
  7. 71
  8. 93
  9. 106
  10. 116
  11. 23
  12. 28
  13. 62
  14. 162
  15. 148
  16. 176
  17. 94
  18. 186
  19. 91
  20. 72
  21. 98
  22. 188
  23. 56
  24. 114
  25. 192
  26. 48
  27. 36
  28. 86
  29. 74
  30. 39
  31. 87
  32. 44
  33. 35
  34. 75
  35. 98
  36. 25
  37. 184
  38. 13
  39. 38
  40. 17

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