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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 260 · 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 74 =
  2. 2.Half of 134 =
  3. 3.Double 88 =
  4. 4.Double 17 =
  5. 5.Double 68 =
  6. 6.Double 47 =
  7. 7.Double 36 =
  8. 8.Half of 104 =
  9. 9.Half of 198 =
  10. 10.Half of 42 =
  11. 11.Double 81 =
  12. 12.Double 28 =
  13. 13.Double 46 =
  14. 14.Double 22 =
  15. 15.Double 89 =
  16. 16.Half of 34 =
  17. 17.Double 72 =
  18. 18.Half of 144 =
  19. 19.Double 86 =
  20. 20.Double 85 =
  21. 21.Half of 36 =
  22. 22.Half of 102 =
  23. 23.Double 61 =
  24. 24.Half of 28 =
  25. 25.Half of 120 =
  26. 26.Half of 166 =
  27. 27.Double 44 =
  28. 28.Half of 148 =
  29. 29.Half of 44 =
  30. 30.Half of 32 =
  31. 31.Double 57 =
  32. 32.Half of 60 =
  33. 33.Half of 78 =
  34. 34.Double 82 =
  35. 35.Half of 174 =
  36. 36.Half of 168 =
  37. 37.Double 94 =
  38. 38.Half of 172 =
  39. 39.Half of 94 =
  40. 40.Double 16 =

Answer key

  1. 148
  2. 67
  3. 176
  4. 34
  5. 136
  6. 94
  7. 72
  8. 52
  9. 99
  10. 21
  11. 162
  12. 56
  13. 92
  14. 44
  15. 178
  16. 17
  17. 144
  18. 72
  19. 172
  20. 170
  21. 18
  22. 51
  23. 122
  24. 14
  25. 60
  26. 83
  27. 88
  28. 74
  29. 22
  30. 16
  31. 114
  32. 30
  33. 39
  34. 164
  35. 87
  36. 84
  37. 188
  38. 86
  39. 47
  40. 32

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