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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 247 · 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 71 =
  2. 2.Half of 48 =
  3. 3.Double 27 =
  4. 4.Double 87 =
  5. 5.Half of 118 =
  6. 6.Double 41 =
  7. 7.Half of 174 =
  8. 8.Double 88 =
  9. 9.Double 85 =
  10. 10.Half of 140 =
  11. 11.Half of 58 =
  12. 12.Double 36 =
  13. 13.Half of 80 =
  14. 14.Double 67 =
  15. 15.Half of 126 =
  16. 16.Half of 38 =
  17. 17.Double 57 =
  18. 18.Half of 144 =
  19. 19.Double 96 =
  20. 20.Double 48 =
  21. 21.Double 73 =
  22. 22.Half of 136 =
  23. 23.Double 38 =
  24. 24.Double 68 =
  25. 25.Double 42 =
  26. 26.Half of 192 =
  27. 27.Half of 78 =
  28. 28.Half of 92 =
  29. 29.Half of 64 =
  30. 30.Double 23 =
  31. 31.Double 37 =
  32. 32.Double 65 =
  33. 33.Double 98 =
  34. 34.Double 33 =
  35. 35.Half of 26 =
  36. 36.Double 59 =
  37. 37.Double 58 =
  38. 38.Double 31 =
  39. 39.Double 74 =
  40. 40.Double 29 =

Answer key

  1. 142
  2. 24
  3. 54
  4. 174
  5. 59
  6. 82
  7. 87
  8. 176
  9. 170
  10. 70
  11. 29
  12. 72
  13. 40
  14. 134
  15. 63
  16. 19
  17. 114
  18. 72
  19. 192
  20. 96
  21. 146
  22. 68
  23. 76
  24. 136
  25. 84
  26. 96
  27. 39
  28. 46
  29. 32
  30. 46
  31. 74
  32. 130
  33. 196
  34. 66
  35. 13
  36. 118
  37. 116
  38. 62
  39. 148
  40. 58

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