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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 659 · 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 56 =
  2. 2.Half of 112 =
  3. 3.Double 71 =
  4. 4.Half of 154 =
  5. 5.Half of 46 =
  6. 6.Double 27 =
  7. 7.Double 91 =
  8. 8.Double 69 =
  9. 9.Double 92 =
  10. 10.Double 87 =
  11. 11.Half of 182 =
  12. 12.Double 59 =
  13. 13.Double 79 =
  14. 14.Double 62 =
  15. 15.Half of 78 =
  16. 16.Double 61 =
  17. 17.Half of 198 =
  18. 18.Double 19 =
  19. 19.Double 84 =
  20. 20.Double 38 =
  21. 21.Double 37 =
  22. 22.Double 29 =
  23. 23.Half of 30 =
  24. 24.Half of 66 =
  25. 25.Double 81 =
  26. 26.Half of 170 =
  27. 27.Double 66 =
  28. 28.Double 47 =
  29. 29.Double 55 =
  30. 30.Half of 64 =
  31. 31.Half of 138 =
  32. 32.Double 24 =
  33. 33.Double 67 =
  34. 34.Double 76 =
  35. 35.Half of 26 =
  36. 36.Half of 48 =
  37. 37.Double 78 =
  38. 38.Double 72 =
  39. 39.Double 51 =
  40. 40.Half of 144 =

Answer key

  1. 28
  2. 56
  3. 142
  4. 77
  5. 23
  6. 54
  7. 182
  8. 138
  9. 184
  10. 174
  11. 91
  12. 118
  13. 158
  14. 124
  15. 39
  16. 122
  17. 99
  18. 38
  19. 168
  20. 76
  21. 74
  22. 58
  23. 15
  24. 33
  25. 162
  26. 85
  27. 132
  28. 94
  29. 110
  30. 32
  31. 69
  32. 48
  33. 134
  34. 152
  35. 13
  36. 24
  37. 156
  38. 144
  39. 102
  40. 72

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