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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 262 · 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 160 =
  2. 2.Half of 48 =
  3. 3.Double 36 =
  4. 4.Double 72 =
  5. 5.Half of 128 =
  6. 6.Double 18 =
  7. 7.Double 95 =
  8. 8.Half of 72 =
  9. 9.Double 91 =
  10. 10.Double 61 =
  11. 11.Double 41 =
  12. 12.Half of 174 =
  13. 13.Half of 178 =
  14. 14.Half of 120 =
  15. 15.Double 71 =
  16. 16.Double 22 =
  17. 17.Half of 28 =
  18. 18.Half of 40 =
  19. 19.Half of 70 =
  20. 20.Double 48 =
  21. 21.Double 67 =
  22. 22.Double 74 =
  23. 23.Half of 42 =
  24. 24.Double 93 =
  25. 25.Half of 130 =
  26. 26.Double 23 =
  27. 27.Half of 46 =
  28. 28.Half of 58 =
  29. 29.Double 97 =
  30. 30.Half of 62 =
  31. 31.Double 16 =
  32. 32.Half of 74 =
  33. 33.Double 66 =
  34. 34.Double 79 =
  35. 35.Half of 36 =
  36. 36.Half of 38 =
  37. 37.Half of 66 =
  38. 38.Half of 154 =
  39. 39.Half of 110 =
  40. 40.Half of 30 =

Answer key

  1. 80
  2. 24
  3. 72
  4. 144
  5. 64
  6. 36
  7. 190
  8. 36
  9. 182
  10. 122
  11. 82
  12. 87
  13. 89
  14. 60
  15. 142
  16. 44
  17. 14
  18. 20
  19. 35
  20. 96
  21. 134
  22. 148
  23. 21
  24. 186
  25. 65
  26. 46
  27. 23
  28. 29
  29. 194
  30. 31
  31. 32
  32. 37
  33. 132
  34. 158
  35. 18
  36. 19
  37. 33
  38. 77
  39. 55
  40. 15

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