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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 305 · 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.Half of 52 =
  3. 3.Double 79 =
  4. 4.Double 59 =
  5. 5.Double 85 =
  6. 6.Half of 112 =
  7. 7.Half of 150 =
  8. 8.Double 16 =
  9. 9.Double 49 =
  10. 10.Double 48 =
  11. 11.Half of 58 =
  12. 12.Double 72 =
  13. 13.Double 69 =
  14. 14.Double 42 =
  15. 15.Half of 160 =
  16. 16.Double 71 =
  17. 17.Double 54 =
  18. 18.Half of 178 =
  19. 19.Half of 122 =
  20. 20.Double 75 =
  21. 21.Double 94 =
  22. 22.Double 46 =
  23. 23.Double 31 =
  24. 24.Half of 154 =
  25. 25.Half of 188 =
  26. 26.Half of 108 =
  27. 27.Half of 126 =
  28. 28.Half of 42 =
  29. 29.Half of 88 =
  30. 30.Half of 196 =
  31. 31.Double 64 =
  32. 32.Double 43 =
  33. 33.Half of 30 =
  34. 34.Double 89 =
  35. 35.Half of 174 =
  36. 36.Double 41 =
  37. 37.Double 24 =
  38. 38.Half of 198 =
  39. 39.Double 86 =
  40. 40.Half of 138 =

Answer key

  1. 50
  2. 26
  3. 158
  4. 118
  5. 170
  6. 56
  7. 75
  8. 32
  9. 98
  10. 96
  11. 29
  12. 144
  13. 138
  14. 84
  15. 80
  16. 142
  17. 108
  18. 89
  19. 61
  20. 150
  21. 188
  22. 92
  23. 62
  24. 77
  25. 94
  26. 54
  27. 63
  28. 21
  29. 44
  30. 98
  31. 128
  32. 86
  33. 15
  34. 178
  35. 87
  36. 82
  37. 48
  38. 99
  39. 172
  40. 69

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