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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 725 · 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 160 =
  2. 2.Double 56 =
  3. 3.Double 38 =
  4. 4.Double 29 =
  5. 5.Half of 34 =
  6. 6.Double 71 =
  7. 7.Half of 186 =
  8. 8.Double 61 =
  9. 9.Double 17 =
  10. 10.Half of 152 =
  11. 11.Double 87 =
  12. 12.Double 21 =
  13. 13.Double 86 =
  14. 14.Double 31 =
  15. 15.Half of 38 =
  16. 16.Double 63 =
  17. 17.Double 22 =
  18. 18.Half of 170 =
  19. 19.Half of 36 =
  20. 20.Double 92 =
  21. 21.Half of 128 =
  22. 22.Half of 132 =
  23. 23.Half of 92 =
  24. 24.Double 53 =
  25. 25.Half of 134 =
  26. 26.Double 46 =
  27. 27.Double 76 =
  28. 28.Half of 144 =
  29. 29.Double 59 =
  30. 30.Double 58 =
  31. 31.Double 72 =
  32. 32.Double 41 =
  33. 33.Half of 174 =
  34. 34.Half of 80 =
  35. 35.Half of 42 =
  36. 36.Half of 78 =
  37. 37.Half of 32 =
  38. 38.Double 16 =
  39. 39.Double 18 =
  40. 40.Double 47 =

Answer key

  1. 80
  2. 112
  3. 76
  4. 58
  5. 17
  6. 142
  7. 93
  8. 122
  9. 34
  10. 76
  11. 174
  12. 42
  13. 172
  14. 62
  15. 19
  16. 126
  17. 44
  18. 85
  19. 18
  20. 184
  21. 64
  22. 66
  23. 46
  24. 106
  25. 67
  26. 92
  27. 152
  28. 72
  29. 118
  30. 116
  31. 144
  32. 82
  33. 87
  34. 40
  35. 21
  36. 39
  37. 16
  38. 32
  39. 36
  40. 94

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