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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 78 · 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 76 =
  2. 2.Double 66 =
  3. 3.Double 31 =
  4. 4.Double 42 =
  5. 5.Double 34 =
  6. 6.Half of 84 =
  7. 7.Double 85 =
  8. 8.Half of 72 =
  9. 9.Half of 98 =
  10. 10.Double 28 =
  11. 11.Double 88 =
  12. 12.Half of 56 =
  13. 13.Half of 62 =
  14. 14.Half of 38 =
  15. 15.Half of 136 =
  16. 16.Half of 132 =
  17. 17.Half of 34 =
  18. 18.Half of 172 =
  19. 19.Half of 162 =
  20. 20.Double 67 =
  21. 21.Double 72 =
  22. 22.Double 97 =
  23. 23.Half of 130 =
  24. 24.Half of 146 =
  25. 25.Double 63 =
  26. 26.Half of 174 =
  27. 27.Half of 74 =
  28. 28.Double 46 =
  29. 29.Half of 80 =
  30. 30.Double 41 =
  31. 31.Half of 116 =
  32. 32.Double 55 =
  33. 33.Double 33 =
  34. 34.Double 16 =
  35. 35.Double 93 =
  36. 36.Double 21 =
  37. 37.Half of 52 =
  38. 38.Half of 36 =
  39. 39.Double 69 =
  40. 40.Half of 158 =

Answer key

  1. 38
  2. 132
  3. 62
  4. 84
  5. 68
  6. 42
  7. 170
  8. 36
  9. 49
  10. 56
  11. 176
  12. 28
  13. 31
  14. 19
  15. 68
  16. 66
  17. 17
  18. 86
  19. 81
  20. 134
  21. 144
  22. 194
  23. 65
  24. 73
  25. 126
  26. 87
  27. 37
  28. 92
  29. 40
  30. 82
  31. 58
  32. 110
  33. 66
  34. 32
  35. 186
  36. 42
  37. 26
  38. 18
  39. 138
  40. 79

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