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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 215 · 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 87 =
  2. 2.Half of 80 =
  3. 3.Half of 124 =
  4. 4.Half of 108 =
  5. 5.Half of 72 =
  6. 6.Half of 136 =
  7. 7.Half of 118 =
  8. 8.Half of 162 =
  9. 9.Half of 104 =
  10. 10.Double 58 =
  11. 11.Double 76 =
  12. 12.Double 52 =
  13. 13.Half of 88 =
  14. 14.Double 23 =
  15. 15.Double 28 =
  16. 16.Double 41 =
  17. 17.Double 73 =
  18. 18.Half of 100 =
  19. 19.Double 71 =
  20. 20.Double 43 =
  21. 21.Double 49 =
  22. 22.Half of 46 =
  23. 23.Half of 188 =
  24. 24.Double 68 =
  25. 25.Half of 164 =
  26. 26.Half of 148 =
  27. 27.Double 97 =
  28. 28.Half of 54 =
  29. 29.Half of 170 =
  30. 30.Half of 82 =
  31. 31.Half of 142 =
  32. 32.Half of 112 =
  33. 33.Double 36 =
  34. 34.Double 66 =
  35. 35.Double 67 =
  36. 36.Half of 150 =
  37. 37.Half of 174 =
  38. 38.Double 19 =
  39. 39.Half of 156 =
  40. 40.Double 27 =

Answer key

  1. 174
  2. 40
  3. 62
  4. 54
  5. 36
  6. 68
  7. 59
  8. 81
  9. 52
  10. 116
  11. 152
  12. 104
  13. 44
  14. 46
  15. 56
  16. 82
  17. 146
  18. 50
  19. 142
  20. 86
  21. 98
  22. 23
  23. 94
  24. 136
  25. 82
  26. 74
  27. 194
  28. 27
  29. 85
  30. 41
  31. 71
  32. 56
  33. 72
  34. 132
  35. 134
  36. 75
  37. 87
  38. 38
  39. 78
  40. 54

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