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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 712 · 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 25 =
  2. 2.Double 76 =
  3. 3.Half of 150 =
  4. 4.Half of 118 =
  5. 5.Double 49 =
  6. 6.Double 99 =
  7. 7.Double 32 =
  8. 8.Double 93 =
  9. 9.Half of 52 =
  10. 10.Half of 190 =
  11. 11.Half of 128 =
  12. 12.Half of 64 =
  13. 13.Half of 94 =
  14. 14.Double 52 =
  15. 15.Double 98 =
  16. 16.Double 81 =
  17. 17.Double 79 =
  18. 18.Half of 38 =
  19. 19.Half of 136 =
  20. 20.Half of 92 =
  21. 21.Double 83 =
  22. 22.Double 89 =
  23. 23.Half of 144 =
  24. 24.Half of 178 =
  25. 25.Double 59 =
  26. 26.Half of 106 =
  27. 27.Half of 164 =
  28. 28.Double 62 =
  29. 29.Half of 138 =
  30. 30.Double 97 =
  31. 31.Double 91 =
  32. 32.Double 64 =
  33. 33.Double 87 =
  34. 34.Double 47 =
  35. 35.Half of 62 =
  36. 36.Half of 140 =
  37. 37.Double 96 =
  38. 38.Double 22 =
  39. 39.Double 37 =
  40. 40.Double 69 =

Answer key

  1. 50
  2. 152
  3. 75
  4. 59
  5. 98
  6. 198
  7. 64
  8. 186
  9. 26
  10. 95
  11. 64
  12. 32
  13. 47
  14. 104
  15. 196
  16. 162
  17. 158
  18. 19
  19. 68
  20. 46
  21. 166
  22. 178
  23. 72
  24. 89
  25. 118
  26. 53
  27. 82
  28. 124
  29. 69
  30. 194
  31. 182
  32. 128
  33. 174
  34. 94
  35. 31
  36. 70
  37. 192
  38. 44
  39. 74
  40. 138

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