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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 818 · 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 31 =
  2. 2.Half of 26 =
  3. 3.Double 86 =
  4. 4.Double 41 =
  5. 5.Double 93 =
  6. 6.Double 61 =
  7. 7.Half of 82 =
  8. 8.Double 36 =
  9. 9.Double 74 =
  10. 10.Double 88 =
  11. 11.Double 71 =
  12. 12.Double 81 =
  13. 13.Half of 62 =
  14. 14.Half of 40 =
  15. 15.Half of 72 =
  16. 16.Double 58 =
  17. 17.Half of 152 =
  18. 18.Double 48 =
  19. 19.Double 57 =
  20. 20.Half of 64 =
  21. 21.Half of 92 =
  22. 22.Half of 56 =
  23. 23.Half of 94 =
  24. 24.Half of 100 =
  25. 25.Double 85 =
  26. 26.Double 67 =
  27. 27.Double 18 =
  28. 28.Half of 108 =
  29. 29.Half of 50 =
  30. 30.Double 19 =
  31. 31.Double 37 =
  32. 32.Double 33 =
  33. 33.Double 96 =
  34. 34.Half of 46 =
  35. 35.Half of 48 =
  36. 36.Half of 110 =
  37. 37.Half of 130 =
  38. 38.Half of 142 =
  39. 39.Double 38 =
  40. 40.Double 21 =

Answer key

  1. 62
  2. 13
  3. 172
  4. 82
  5. 186
  6. 122
  7. 41
  8. 72
  9. 148
  10. 176
  11. 142
  12. 162
  13. 31
  14. 20
  15. 36
  16. 116
  17. 76
  18. 96
  19. 114
  20. 32
  21. 46
  22. 28
  23. 47
  24. 50
  25. 170
  26. 134
  27. 36
  28. 54
  29. 25
  30. 38
  31. 74
  32. 66
  33. 192
  34. 23
  35. 24
  36. 55
  37. 65
  38. 71
  39. 76
  40. 42

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