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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 186 · 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 62 =
  2. 2.Double 26 =
  3. 3.Half of 64 =
  4. 4.Half of 138 =
  5. 5.Half of 96 =
  6. 6.Double 59 =
  7. 7.Double 65 =
  8. 8.Double 61 =
  9. 9.Half of 128 =
  10. 10.Half of 74 =
  11. 11.Double 99 =
  12. 12.Double 79 =
  13. 13.Double 48 =
  14. 14.Double 27 =
  15. 15.Half of 188 =
  16. 16.Half of 78 =
  17. 17.Half of 118 =
  18. 18.Double 82 =
  19. 19.Half of 126 =
  20. 20.Double 96 =
  21. 21.Half of 102 =
  22. 22.Double 22 =
  23. 23.Double 32 =
  24. 24.Double 57 =
  25. 25.Double 56 =
  26. 26.Half of 36 =
  27. 27.Half of 156 =
  28. 28.Half of 178 =
  29. 29.Double 73 =
  30. 30.Half of 30 =
  31. 31.Double 24 =
  32. 32.Double 68 =
  33. 33.Half of 170 =
  34. 34.Half of 28 =
  35. 35.Double 91 =
  36. 36.Half of 92 =
  37. 37.Half of 76 =
  38. 38.Double 67 =
  39. 39.Half of 148 =
  40. 40.Double 19 =

Answer key

  1. 124
  2. 52
  3. 32
  4. 69
  5. 48
  6. 118
  7. 130
  8. 122
  9. 64
  10. 37
  11. 198
  12. 158
  13. 96
  14. 54
  15. 94
  16. 39
  17. 59
  18. 164
  19. 63
  20. 192
  21. 51
  22. 44
  23. 64
  24. 114
  25. 112
  26. 18
  27. 78
  28. 89
  29. 146
  30. 15
  31. 48
  32. 136
  33. 85
  34. 14
  35. 182
  36. 46
  37. 38
  38. 134
  39. 74
  40. 38

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