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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 27 · 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 37 =
  2. 2.Half of 170 =
  3. 3.Double 19 =
  4. 4.Half of 128 =
  5. 5.Half of 28 =
  6. 6.Double 75 =
  7. 7.Double 23 =
  8. 8.Double 69 =
  9. 9.Double 93 =
  10. 10.Half of 146 =
  11. 11.Half of 162 =
  12. 12.Half of 174 =
  13. 13.Half of 70 =
  14. 14.Half of 76 =
  15. 15.Half of 178 =
  16. 16.Double 82 =
  17. 17.Double 63 =
  18. 18.Double 84 =
  19. 19.Half of 182 =
  20. 20.Double 24 =
  21. 21.Half of 30 =
  22. 22.Double 38 =
  23. 23.Double 92 =
  24. 24.Half of 56 =
  25. 25.Half of 138 =
  26. 26.Half of 92 =
  27. 27.Double 18 =
  28. 28.Double 53 =
  29. 29.Half of 176 =
  30. 30.Half of 186 =
  31. 31.Double 34 =
  32. 32.Double 66 =
  33. 33.Half of 158 =
  34. 34.Half of 52 =
  35. 35.Half of 118 =
  36. 36.Double 78 =
  37. 37.Double 89 =
  38. 38.Half of 140 =
  39. 39.Double 29 =
  40. 40.Double 21 =

Answer key

  1. 74
  2. 85
  3. 38
  4. 64
  5. 14
  6. 150
  7. 46
  8. 138
  9. 186
  10. 73
  11. 81
  12. 87
  13. 35
  14. 38
  15. 89
  16. 164
  17. 126
  18. 168
  19. 91
  20. 48
  21. 15
  22. 76
  23. 184
  24. 28
  25. 69
  26. 46
  27. 36
  28. 106
  29. 88
  30. 93
  31. 68
  32. 132
  33. 79
  34. 26
  35. 59
  36. 156
  37. 178
  38. 70
  39. 58
  40. 42

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