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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 760 · 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 21 =
  2. 2.Double 34 =
  3. 3.Half of 194 =
  4. 4.Half of 34 =
  5. 5.Half of 124 =
  6. 6.Half of 122 =
  7. 7.Half of 146 =
  8. 8.Double 62 =
  9. 9.Double 43 =
  10. 10.Double 64 =
  11. 11.Half of 98 =
  12. 12.Double 18 =
  13. 13.Half of 120 =
  14. 14.Double 36 =
  15. 15.Half of 162 =
  16. 16.Double 31 =
  17. 17.Double 27 =
  18. 18.Half of 38 =
  19. 19.Double 56 =
  20. 20.Double 91 =
  21. 21.Half of 84 =
  22. 22.Double 85 =
  23. 23.Half of 86 =
  24. 24.Double 75 =
  25. 25.Double 51 =
  26. 26.Double 25 =
  27. 27.Half of 66 =
  28. 28.Half of 168 =
  29. 29.Double 58 =
  30. 30.Half of 126 =
  31. 31.Double 47 =
  32. 32.Half of 36 =
  33. 33.Double 23 =
  34. 34.Double 22 =
  35. 35.Double 55 =
  36. 36.Half of 134 =
  37. 37.Double 73 =
  38. 38.Half of 82 =
  39. 39.Half of 178 =
  40. 40.Double 94 =

Answer key

  1. 42
  2. 68
  3. 97
  4. 17
  5. 62
  6. 61
  7. 73
  8. 124
  9. 86
  10. 128
  11. 49
  12. 36
  13. 60
  14. 72
  15. 81
  16. 62
  17. 54
  18. 19
  19. 112
  20. 182
  21. 42
  22. 170
  23. 43
  24. 150
  25. 102
  26. 50
  27. 33
  28. 84
  29. 116
  30. 63
  31. 94
  32. 18
  33. 46
  34. 44
  35. 110
  36. 67
  37. 146
  38. 41
  39. 89
  40. 188

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