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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 396 · 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 180 =
  2. 2.Double 42 =
  3. 3.Half of 88 =
  4. 4.Double 35 =
  5. 5.Half of 52 =
  6. 6.Double 54 =
  7. 7.Half of 184 =
  8. 8.Half of 120 =
  9. 9.Double 95 =
  10. 10.Half of 176 =
  11. 11.Half of 48 =
  12. 12.Half of 164 =
  13. 13.Double 69 =
  14. 14.Half of 122 =
  15. 15.Double 88 =
  16. 16.Half of 148 =
  17. 17.Double 84 =
  18. 18.Double 34 =
  19. 19.Double 56 =
  20. 20.Double 53 =
  21. 21.Double 65 =
  22. 22.Double 27 =
  23. 23.Half of 186 =
  24. 24.Double 33 =
  25. 25.Half of 144 =
  26. 26.Double 22 =
  27. 27.Half of 128 =
  28. 28.Double 74 =
  29. 29.Half of 196 =
  30. 30.Half of 194 =
  31. 31.Double 38 =
  32. 32.Half of 140 =
  33. 33.Double 55 =
  34. 34.Half of 114 =
  35. 35.Half of 108 =
  36. 36.Double 82 =
  37. 37.Double 52 =
  38. 38.Half of 54 =
  39. 39.Half of 134 =
  40. 40.Double 28 =

Answer key

  1. 90
  2. 84
  3. 44
  4. 70
  5. 26
  6. 108
  7. 92
  8. 60
  9. 190
  10. 88
  11. 24
  12. 82
  13. 138
  14. 61
  15. 176
  16. 74
  17. 168
  18. 68
  19. 112
  20. 106
  21. 130
  22. 54
  23. 93
  24. 66
  25. 72
  26. 44
  27. 64
  28. 148
  29. 98
  30. 97
  31. 76
  32. 70
  33. 110
  34. 57
  35. 54
  36. 164
  37. 104
  38. 27
  39. 67
  40. 56

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