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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 536 · 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 74 =
  2. 2.Double 91 =
  3. 3.Half of 178 =
  4. 4.Half of 198 =
  5. 5.Half of 40 =
  6. 6.Double 81 =
  7. 7.Half of 44 =
  8. 8.Double 41 =
  9. 9.Double 45 =
  10. 10.Double 31 =
  11. 11.Half of 196 =
  12. 12.Half of 38 =
  13. 13.Double 52 =
  14. 14.Half of 28 =
  15. 15.Half of 104 =
  16. 16.Double 99 =
  17. 17.Half of 30 =
  18. 18.Double 17 =
  19. 19.Half of 64 =
  20. 20.Double 62 =
  21. 21.Double 35 =
  22. 22.Half of 188 =
  23. 23.Half of 84 =
  24. 24.Half of 130 =
  25. 25.Half of 92 =
  26. 26.Double 26 =
  27. 27.Double 23 =
  28. 28.Double 61 =
  29. 29.Half of 124 =
  30. 30.Double 98 =
  31. 31.Half of 52 =
  32. 32.Double 64 =
  33. 33.Double 74 =
  34. 34.Half of 186 =
  35. 35.Half of 50 =
  36. 36.Double 49 =
  37. 37.Half of 42 =
  38. 38.Double 95 =
  39. 39.Half of 90 =
  40. 40.Half of 128 =

Answer key

  1. 37
  2. 182
  3. 89
  4. 99
  5. 20
  6. 162
  7. 22
  8. 82
  9. 90
  10. 62
  11. 98
  12. 19
  13. 104
  14. 14
  15. 52
  16. 198
  17. 15
  18. 34
  19. 32
  20. 124
  21. 70
  22. 94
  23. 42
  24. 65
  25. 46
  26. 52
  27. 46
  28. 122
  29. 62
  30. 196
  31. 26
  32. 128
  33. 148
  34. 93
  35. 25
  36. 98
  37. 21
  38. 190
  39. 45
  40. 64

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