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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 213 · 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 170 =
  2. 2.Double 39 =
  3. 3.Double 59 =
  4. 4.Half of 92 =
  5. 5.Double 43 =
  6. 6.Double 51 =
  7. 7.Double 73 =
  8. 8.Double 19 =
  9. 9.Half of 116 =
  10. 10.Half of 42 =
  11. 11.Double 72 =
  12. 12.Double 28 =
  13. 13.Half of 184 =
  14. 14.Half of 186 =
  15. 15.Double 61 =
  16. 16.Half of 144 =
  17. 17.Double 48 =
  18. 18.Double 33 =
  19. 19.Double 58 =
  20. 20.Double 49 =
  21. 21.Double 85 =
  22. 22.Double 95 =
  23. 23.Double 75 =
  24. 24.Double 88 =
  25. 25.Half of 108 =
  26. 26.Half of 110 =
  27. 27.Double 44 =
  28. 28.Half of 62 =
  29. 29.Half of 192 =
  30. 30.Half of 52 =
  31. 31.Half of 140 =
  32. 32.Half of 86 =
  33. 33.Double 92 =
  34. 34.Half of 58 =
  35. 35.Double 21 =
  36. 36.Double 29 =
  37. 37.Half of 122 =
  38. 38.Double 54 =
  39. 39.Double 22 =
  40. 40.Double 81 =

Answer key

  1. 85
  2. 78
  3. 118
  4. 46
  5. 86
  6. 102
  7. 146
  8. 38
  9. 58
  10. 21
  11. 144
  12. 56
  13. 92
  14. 93
  15. 122
  16. 72
  17. 96
  18. 66
  19. 116
  20. 98
  21. 170
  22. 190
  23. 150
  24. 176
  25. 54
  26. 55
  27. 88
  28. 31
  29. 96
  30. 26
  31. 70
  32. 43
  33. 184
  34. 29
  35. 42
  36. 58
  37. 61
  38. 108
  39. 44
  40. 162

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