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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 17 · 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 50 =
  2. 2.Double 89 =
  3. 3.Double 23 =
  4. 4.Half of 42 =
  5. 5.Double 71 =
  6. 6.Half of 100 =
  7. 7.Double 83 =
  8. 8.Half of 88 =
  9. 9.Half of 198 =
  10. 10.Double 94 =
  11. 11.Half of 76 =
  12. 12.Half of 170 =
  13. 13.Double 51 =
  14. 14.Half of 62 =
  15. 15.Half of 116 =
  16. 16.Half of 26 =
  17. 17.Double 75 =
  18. 18.Double 26 =
  19. 19.Double 93 =
  20. 20.Half of 44 =
  21. 21.Half of 52 =
  22. 22.Double 92 =
  23. 23.Half of 148 =
  24. 24.Half of 162 =
  25. 25.Double 74 =
  26. 26.Double 25 =
  27. 27.Half of 64 =
  28. 28.Half of 80 =
  29. 29.Double 17 =
  30. 30.Double 52 =
  31. 31.Double 31 =
  32. 32.Half of 194 =
  33. 33.Double 86 =
  34. 34.Double 42 =
  35. 35.Double 53 =
  36. 36.Half of 30 =
  37. 37.Half of 192 =
  38. 38.Half of 90 =
  39. 39.Double 44 =
  40. 40.Half of 32 =

Answer key

  1. 25
  2. 178
  3. 46
  4. 21
  5. 142
  6. 50
  7. 166
  8. 44
  9. 99
  10. 188
  11. 38
  12. 85
  13. 102
  14. 31
  15. 58
  16. 13
  17. 150
  18. 52
  19. 186
  20. 22
  21. 26
  22. 184
  23. 74
  24. 81
  25. 148
  26. 50
  27. 32
  28. 40
  29. 34
  30. 104
  31. 62
  32. 97
  33. 172
  34. 84
  35. 106
  36. 15
  37. 96
  38. 45
  39. 88
  40. 16

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