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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 8 · 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 192 =
  2. 2.Double 46 =
  3. 3.Half of 122 =
  4. 4.Double 47 =
  5. 5.Double 41 =
  6. 6.Double 55 =
  7. 7.Half of 174 =
  8. 8.Half of 38 =
  9. 9.Double 16 =
  10. 10.Half of 64 =
  11. 11.Half of 36 =
  12. 12.Half of 128 =
  13. 13.Double 62 =
  14. 14.Double 78 =
  15. 15.Double 63 =
  16. 16.Half of 176 =
  17. 17.Double 21 =
  18. 18.Double 17 =
  19. 19.Double 35 =
  20. 20.Half of 118 =
  21. 21.Double 37 =
  22. 22.Half of 152 =
  23. 23.Double 61 =
  24. 24.Double 31 =
  25. 25.Double 65 =
  26. 26.Double 92 =
  27. 27.Double 49 =
  28. 28.Double 38 =
  29. 29.Half of 188 =
  30. 30.Half of 110 =
  31. 31.Double 36 =
  32. 32.Half of 44 =
  33. 33.Double 23 =
  34. 34.Half of 92 =
  35. 35.Half of 114 =
  36. 36.Double 91 =
  37. 37.Half of 106 =
  38. 38.Double 32 =
  39. 39.Half of 132 =
  40. 40.Half of 142 =

Answer key

  1. 96
  2. 92
  3. 61
  4. 94
  5. 82
  6. 110
  7. 87
  8. 19
  9. 32
  10. 32
  11. 18
  12. 64
  13. 124
  14. 156
  15. 126
  16. 88
  17. 42
  18. 34
  19. 70
  20. 59
  21. 74
  22. 76
  23. 122
  24. 62
  25. 130
  26. 184
  27. 98
  28. 76
  29. 94
  30. 55
  31. 72
  32. 22
  33. 46
  34. 46
  35. 57
  36. 182
  37. 53
  38. 64
  39. 66
  40. 71

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