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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 450 · 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 58 =
  2. 2.Half of 176 =
  3. 3.Double 61 =
  4. 4.Half of 36 =
  5. 5.Half of 46 =
  6. 6.Half of 64 =
  7. 7.Half of 108 =
  8. 8.Double 26 =
  9. 9.Half of 30 =
  10. 10.Double 72 =
  11. 11.Double 64 =
  12. 12.Half of 144 =
  13. 13.Double 89 =
  14. 14.Double 45 =
  15. 15.Double 91 =
  16. 16.Double 93 =
  17. 17.Double 96 =
  18. 18.Half of 62 =
  19. 19.Double 69 =
  20. 20.Double 95 =
  21. 21.Double 94 =
  22. 22.Half of 52 =
  23. 23.Half of 148 =
  24. 24.Double 46 =
  25. 25.Double 41 =
  26. 26.Double 63 =
  27. 27.Half of 124 =
  28. 28.Double 47 =
  29. 29.Double 83 =
  30. 30.Double 34 =
  31. 31.Double 66 =
  32. 32.Half of 110 =
  33. 33.Half of 134 =
  34. 34.Double 58 =
  35. 35.Half of 102 =
  36. 36.Double 31 =
  37. 37.Half of 32 =
  38. 38.Double 33 =
  39. 39.Half of 186 =
  40. 40.Half of 40 =

Answer key

  1. 29
  2. 88
  3. 122
  4. 18
  5. 23
  6. 32
  7. 54
  8. 52
  9. 15
  10. 144
  11. 128
  12. 72
  13. 178
  14. 90
  15. 182
  16. 186
  17. 192
  18. 31
  19. 138
  20. 190
  21. 188
  22. 26
  23. 74
  24. 92
  25. 82
  26. 126
  27. 62
  28. 94
  29. 166
  30. 68
  31. 132
  32. 55
  33. 67
  34. 116
  35. 51
  36. 62
  37. 16
  38. 66
  39. 93
  40. 20

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