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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 219 · 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 28 =
  2. 2.Double 71 =
  3. 3.Double 45 =
  4. 4.Double 73 =
  5. 5.Half of 118 =
  6. 6.Half of 64 =
  7. 7.Half of 174 =
  8. 8.Double 64 =
  9. 9.Half of 132 =
  10. 10.Double 82 =
  11. 11.Double 49 =
  12. 12.Double 35 =
  13. 13.Double 63 =
  14. 14.Double 42 =
  15. 15.Double 91 =
  16. 16.Double 17 =
  17. 17.Double 32 =
  18. 18.Half of 180 =
  19. 19.Half of 188 =
  20. 20.Double 99 =
  21. 21.Double 85 =
  22. 22.Double 36 =
  23. 23.Double 79 =
  24. 24.Double 21 =
  25. 25.Half of 176 =
  26. 26.Double 84 =
  27. 27.Double 58 =
  28. 28.Double 48 =
  29. 29.Double 57 =
  30. 30.Double 78 =
  31. 31.Double 62 =
  32. 32.Half of 192 =
  33. 33.Double 67 =
  34. 34.Double 24 =
  35. 35.Double 81 =
  36. 36.Half of 66 =
  37. 37.Double 47 =
  38. 38.Double 72 =
  39. 39.Half of 190 =
  40. 40.Half of 102 =

Answer key

  1. 56
  2. 142
  3. 90
  4. 146
  5. 59
  6. 32
  7. 87
  8. 128
  9. 66
  10. 164
  11. 98
  12. 70
  13. 126
  14. 84
  15. 182
  16. 34
  17. 64
  18. 90
  19. 94
  20. 198
  21. 170
  22. 72
  23. 158
  24. 42
  25. 88
  26. 168
  27. 116
  28. 96
  29. 114
  30. 156
  31. 124
  32. 96
  33. 134
  34. 48
  35. 162
  36. 33
  37. 94
  38. 144
  39. 95
  40. 51

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