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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 603 · 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.Double 81 =
  2. 2.Half of 172 =
  3. 3.Double 62 =
  4. 4.Double 92 =
  5. 5.Double 97 =
  6. 6.Double 55 =
  7. 7.Double 24 =
  8. 8.Double 37 =
  9. 9.Half of 98 =
  10. 10.Double 75 =
  11. 11.Double 56 =
  12. 12.Half of 100 =
  13. 13.Half of 112 =
  14. 14.Double 71 =
  15. 15.Double 28 =
  16. 16.Half of 72 =
  17. 17.Half of 34 =
  18. 18.Half of 150 =
  19. 19.Half of 74 =
  20. 20.Double 65 =
  21. 21.Half of 196 =
  22. 22.Half of 188 =
  23. 23.Half of 148 =
  24. 24.Half of 118 =
  25. 25.Double 29 =
  26. 26.Double 84 =
  27. 27.Double 54 =
  28. 28.Half of 44 =
  29. 29.Double 23 =
  30. 30.Double 74 =
  31. 31.Half of 60 =
  32. 32.Half of 116 =
  33. 33.Double 34 =
  34. 34.Half of 110 =
  35. 35.Double 46 =
  36. 36.Double 68 =
  37. 37.Double 35 =
  38. 38.Double 83 =
  39. 39.Half of 194 =
  40. 40.Half of 26 =

Answer key

  1. 162
  2. 86
  3. 124
  4. 184
  5. 194
  6. 110
  7. 48
  8. 74
  9. 49
  10. 150
  11. 112
  12. 50
  13. 56
  14. 142
  15. 56
  16. 36
  17. 17
  18. 75
  19. 37
  20. 130
  21. 98
  22. 94
  23. 74
  24. 59
  25. 58
  26. 168
  27. 108
  28. 22
  29. 46
  30. 148
  31. 30
  32. 58
  33. 68
  34. 55
  35. 92
  36. 136
  37. 70
  38. 166
  39. 97
  40. 13

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