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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 421 · 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 40 =
  2. 2.Half of 164 =
  3. 3.Half of 86 =
  4. 4.Half of 60 =
  5. 5.Double 66 =
  6. 6.Half of 122 =
  7. 7.Double 88 =
  8. 8.Half of 104 =
  9. 9.Half of 112 =
  10. 10.Double 53 =
  11. 11.Half of 34 =
  12. 12.Double 94 =
  13. 13.Double 81 =
  14. 14.Double 16 =
  15. 15.Half of 118 =
  16. 16.Half of 30 =
  17. 17.Double 22 =
  18. 18.Double 57 =
  19. 19.Double 21 =
  20. 20.Double 41 =
  21. 21.Double 93 =
  22. 22.Half of 72 =
  23. 23.Double 79 =
  24. 24.Half of 154 =
  25. 25.Half of 64 =
  26. 26.Half of 90 =
  27. 27.Double 71 =
  28. 28.Half of 42 =
  29. 29.Half of 190 =
  30. 30.Half of 156 =
  31. 31.Double 35 =
  32. 32.Half of 148 =
  33. 33.Half of 106 =
  34. 34.Half of 196 =
  35. 35.Half of 172 =
  36. 36.Double 59 =
  37. 37.Double 34 =
  38. 38.Half of 100 =
  39. 39.Half of 46 =
  40. 40.Double 61 =

Answer key

  1. 20
  2. 82
  3. 43
  4. 30
  5. 132
  6. 61
  7. 176
  8. 52
  9. 56
  10. 106
  11. 17
  12. 188
  13. 162
  14. 32
  15. 59
  16. 15
  17. 44
  18. 114
  19. 42
  20. 82
  21. 186
  22. 36
  23. 158
  24. 77
  25. 32
  26. 45
  27. 142
  28. 21
  29. 95
  30. 78
  31. 70
  32. 74
  33. 53
  34. 98
  35. 86
  36. 118
  37. 68
  38. 50
  39. 23
  40. 122

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