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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 645 · 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.Double 77 =
  3. 3.Half of 52 =
  4. 4.Half of 134 =
  5. 5.Half of 44 =
  6. 6.Half of 154 =
  7. 7.Double 91 =
  8. 8.Half of 86 =
  9. 9.Half of 54 =
  10. 10.Half of 30 =
  11. 11.Double 48 =
  12. 12.Double 67 =
  13. 13.Half of 38 =
  14. 14.Half of 58 =
  15. 15.Double 78 =
  16. 16.Half of 104 =
  17. 17.Half of 174 =
  18. 18.Half of 128 =
  19. 19.Half of 60 =
  20. 20.Double 43 =
  21. 21.Double 65 =
  22. 22.Half of 126 =
  23. 23.Half of 50 =
  24. 24.Double 36 =
  25. 25.Half of 130 =
  26. 26.Double 84 =
  27. 27.Double 95 =
  28. 28.Half of 98 =
  29. 29.Double 21 =
  30. 30.Half of 40 =
  31. 31.Double 62 =
  32. 32.Double 52 =
  33. 33.Double 41 =
  34. 34.Half of 100 =
  35. 35.Half of 34 =
  36. 36.Double 64 =
  37. 37.Half of 146 =
  38. 38.Half of 120 =
  39. 39.Double 49 =
  40. 40.Double 16 =

Answer key

  1. 62
  2. 154
  3. 26
  4. 67
  5. 22
  6. 77
  7. 182
  8. 43
  9. 27
  10. 15
  11. 96
  12. 134
  13. 19
  14. 29
  15. 156
  16. 52
  17. 87
  18. 64
  19. 30
  20. 86
  21. 130
  22. 63
  23. 25
  24. 72
  25. 65
  26. 168
  27. 190
  28. 49
  29. 42
  30. 20
  31. 124
  32. 104
  33. 82
  34. 50
  35. 17
  36. 128
  37. 73
  38. 60
  39. 98
  40. 32

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