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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 640 · 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 126 =
  2. 2.Half of 34 =
  3. 3.Double 31 =
  4. 4.Half of 94 =
  5. 5.Double 68 =
  6. 6.Half of 148 =
  7. 7.Double 59 =
  8. 8.Half of 146 =
  9. 9.Half of 36 =
  10. 10.Half of 140 =
  11. 11.Double 23 =
  12. 12.Half of 52 =
  13. 13.Double 26 =
  14. 14.Half of 158 =
  15. 15.Double 56 =
  16. 16.Double 96 =
  17. 17.Half of 48 =
  18. 18.Double 22 =
  19. 19.Half of 130 =
  20. 20.Double 28 =
  21. 21.Half of 174 =
  22. 22.Half of 114 =
  23. 23.Double 75 =
  24. 24.Half of 134 =
  25. 25.Half of 172 =
  26. 26.Double 98 =
  27. 27.Double 45 =
  28. 28.Double 81 =
  29. 29.Half of 86 =
  30. 30.Double 54 =
  31. 31.Half of 42 =
  32. 32.Double 97 =
  33. 33.Half of 136 =
  34. 34.Half of 50 =
  35. 35.Double 61 =
  36. 36.Double 76 =
  37. 37.Double 47 =
  38. 38.Half of 74 =
  39. 39.Double 24 =
  40. 40.Half of 88 =

Answer key

  1. 63
  2. 17
  3. 62
  4. 47
  5. 136
  6. 74
  7. 118
  8. 73
  9. 18
  10. 70
  11. 46
  12. 26
  13. 52
  14. 79
  15. 112
  16. 192
  17. 24
  18. 44
  19. 65
  20. 56
  21. 87
  22. 57
  23. 150
  24. 67
  25. 86
  26. 196
  27. 90
  28. 162
  29. 43
  30. 108
  31. 21
  32. 194
  33. 68
  34. 25
  35. 122
  36. 152
  37. 94
  38. 37
  39. 48
  40. 44

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