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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 291 · 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 74 =
  2. 2.Half of 156 =
  3. 3.Half of 106 =
  4. 4.Double 16 =
  5. 5.Half of 142 =
  6. 6.Double 67 =
  7. 7.Double 83 =
  8. 8.Half of 76 =
  9. 9.Double 61 =
  10. 10.Double 76 =
  11. 11.Double 94 =
  12. 12.Half of 64 =
  13. 13.Double 75 =
  14. 14.Half of 140 =
  15. 15.Double 88 =
  16. 16.Half of 158 =
  17. 17.Double 64 =
  18. 18.Half of 110 =
  19. 19.Half of 58 =
  20. 20.Double 31 =
  21. 21.Half of 38 =
  22. 22.Double 25 =
  23. 23.Half of 138 =
  24. 24.Double 73 =
  25. 25.Half of 56 =
  26. 26.Half of 180 =
  27. 27.Double 19 =
  28. 28.Half of 182 =
  29. 29.Half of 178 =
  30. 30.Half of 60 =
  31. 31.Double 23 =
  32. 32.Double 56 =
  33. 33.Double 86 =
  34. 34.Double 29 =
  35. 35.Double 44 =
  36. 36.Half of 154 =
  37. 37.Half of 168 =
  38. 38.Half of 118 =
  39. 39.Half of 194 =
  40. 40.Double 54 =

Answer key

  1. 148
  2. 78
  3. 53
  4. 32
  5. 71
  6. 134
  7. 166
  8. 38
  9. 122
  10. 152
  11. 188
  12. 32
  13. 150
  14. 70
  15. 176
  16. 79
  17. 128
  18. 55
  19. 29
  20. 62
  21. 19
  22. 50
  23. 69
  24. 146
  25. 28
  26. 90
  27. 38
  28. 91
  29. 89
  30. 30
  31. 46
  32. 112
  33. 172
  34. 58
  35. 88
  36. 77
  37. 84
  38. 59
  39. 97
  40. 108

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