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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 579 · 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 44 =
  2. 2.Half of 192 =
  3. 3.Double 73 =
  4. 4.Half of 172 =
  5. 5.Half of 118 =
  6. 6.Double 89 =
  7. 7.Double 77 =
  8. 8.Double 28 =
  9. 9.Double 72 =
  10. 10.Double 59 =
  11. 11.Half of 36 =
  12. 12.Double 67 =
  13. 13.Half of 62 =
  14. 14.Half of 28 =
  15. 15.Half of 162 =
  16. 16.Half of 56 =
  17. 17.Double 96 =
  18. 18.Half of 132 =
  19. 19.Double 46 =
  20. 20.Half of 60 =
  21. 21.Half of 112 =
  22. 22.Double 32 =
  23. 23.Double 22 =
  24. 24.Half of 122 =
  25. 25.Double 41 =
  26. 26.Double 76 =
  27. 27.Double 95 =
  28. 28.Double 57 =
  29. 29.Half of 50 =
  30. 30.Half of 102 =
  31. 31.Half of 46 =
  32. 32.Half of 186 =
  33. 33.Half of 154 =
  34. 34.Double 71 =
  35. 35.Double 98 =
  36. 36.Double 18 =
  37. 37.Half of 70 =
  38. 38.Half of 88 =
  39. 39.Half of 76 =
  40. 40.Double 62 =

Answer key

  1. 88
  2. 96
  3. 146
  4. 86
  5. 59
  6. 178
  7. 154
  8. 56
  9. 144
  10. 118
  11. 18
  12. 134
  13. 31
  14. 14
  15. 81
  16. 28
  17. 192
  18. 66
  19. 92
  20. 30
  21. 56
  22. 64
  23. 44
  24. 61
  25. 82
  26. 152
  27. 190
  28. 114
  29. 25
  30. 51
  31. 23
  32. 93
  33. 77
  34. 142
  35. 196
  36. 36
  37. 35
  38. 44
  39. 38
  40. 124

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