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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 600 · 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 47 =
  2. 2.Half of 158 =
  3. 3.Double 21 =
  4. 4.Half of 102 =
  5. 5.Double 86 =
  6. 6.Half of 126 =
  7. 7.Double 35 =
  8. 8.Double 71 =
  9. 9.Half of 42 =
  10. 10.Double 44 =
  11. 11.Half of 64 =
  12. 12.Half of 166 =
  13. 13.Double 91 =
  14. 14.Double 41 =
  15. 15.Half of 164 =
  16. 16.Double 31 =
  17. 17.Half of 130 =
  18. 18.Double 84 =
  19. 19.Half of 76 =
  20. 20.Double 94 =
  21. 21.Double 16 =
  22. 22.Double 66 =
  23. 23.Half of 182 =
  24. 24.Double 33 =
  25. 25.Double 92 =
  26. 26.Half of 176 =
  27. 27.Double 49 =
  28. 28.Half of 68 =
  29. 29.Half of 54 =
  30. 30.Double 42 =
  31. 31.Half of 186 =
  32. 32.Double 17 =
  33. 33.Half of 154 =
  34. 34.Double 36 =
  35. 35.Half of 52 =
  36. 36.Double 58 =
  37. 37.Double 51 =
  38. 38.Half of 74 =
  39. 39.Half of 40 =
  40. 40.Double 59 =

Answer key

  1. 94
  2. 79
  3. 42
  4. 51
  5. 172
  6. 63
  7. 70
  8. 142
  9. 21
  10. 88
  11. 32
  12. 83
  13. 182
  14. 82
  15. 82
  16. 62
  17. 65
  18. 168
  19. 38
  20. 188
  21. 32
  22. 132
  23. 91
  24. 66
  25. 184
  26. 88
  27. 98
  28. 34
  29. 27
  30. 84
  31. 93
  32. 34
  33. 77
  34. 72
  35. 26
  36. 116
  37. 102
  38. 37
  39. 20
  40. 118

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