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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 528 · 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 136 =
  2. 2.Double 36 =
  3. 3.Half of 174 =
  4. 4.Double 94 =
  5. 5.Double 27 =
  6. 6.Double 58 =
  7. 7.Double 78 =
  8. 8.Double 38 =
  9. 9.Half of 172 =
  10. 10.Double 55 =
  11. 11.Half of 192 =
  12. 12.Double 86 =
  13. 13.Double 31 =
  14. 14.Double 46 =
  15. 15.Double 84 =
  16. 16.Double 59 =
  17. 17.Half of 144 =
  18. 18.Half of 64 =
  19. 19.Double 92 =
  20. 20.Double 39 =
  21. 21.Half of 124 =
  22. 22.Half of 60 =
  23. 23.Double 89 =
  24. 24.Half of 120 =
  25. 25.Double 34 =
  26. 26.Double 85 =
  27. 27.Half of 190 =
  28. 28.Double 19 =
  29. 29.Double 74 =
  30. 30.Half of 132 =
  31. 31.Half of 166 =
  32. 32.Half of 160 =
  33. 33.Double 57 =
  34. 34.Half of 180 =
  35. 35.Double 37 =
  36. 36.Half of 88 =
  37. 37.Half of 92 =
  38. 38.Half of 114 =
  39. 39.Double 75 =
  40. 40.Double 26 =

Answer key

  1. 68
  2. 72
  3. 87
  4. 188
  5. 54
  6. 116
  7. 156
  8. 76
  9. 86
  10. 110
  11. 96
  12. 172
  13. 62
  14. 92
  15. 168
  16. 118
  17. 72
  18. 32
  19. 184
  20. 78
  21. 62
  22. 30
  23. 178
  24. 60
  25. 68
  26. 170
  27. 95
  28. 38
  29. 148
  30. 66
  31. 83
  32. 80
  33. 114
  34. 90
  35. 74
  36. 44
  37. 46
  38. 57
  39. 150
  40. 52

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