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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 93 · 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 27 =
  2. 2.Half of 92 =
  3. 3.Half of 102 =
  4. 4.Double 18 =
  5. 5.Half of 58 =
  6. 6.Double 97 =
  7. 7.Half of 48 =
  8. 8.Double 49 =
  9. 9.Double 35 =
  10. 10.Half of 62 =
  11. 11.Half of 68 =
  12. 12.Double 21 =
  13. 13.Double 77 =
  14. 14.Half of 60 =
  15. 15.Double 52 =
  16. 16.Half of 164 =
  17. 17.Double 87 =
  18. 18.Double 91 =
  19. 19.Half of 74 =
  20. 20.Half of 126 =
  21. 21.Double 73 =
  22. 22.Half of 172 =
  23. 23.Double 62 =
  24. 24.Double 98 =
  25. 25.Double 69 =
  26. 26.Half of 30 =
  27. 27.Double 71 =
  28. 28.Double 75 =
  29. 29.Double 79 =
  30. 30.Double 57 =
  31. 31.Half of 32 =
  32. 32.Half of 152 =
  33. 33.Half of 140 =
  34. 34.Half of 180 =
  35. 35.Half of 112 =
  36. 36.Double 28 =
  37. 37.Double 36 =
  38. 38.Double 61 =
  39. 39.Double 64 =
  40. 40.Double 31 =

Answer key

  1. 54
  2. 46
  3. 51
  4. 36
  5. 29
  6. 194
  7. 24
  8. 98
  9. 70
  10. 31
  11. 34
  12. 42
  13. 154
  14. 30
  15. 104
  16. 82
  17. 174
  18. 182
  19. 37
  20. 63
  21. 146
  22. 86
  23. 124
  24. 196
  25. 138
  26. 15
  27. 142
  28. 150
  29. 158
  30. 114
  31. 16
  32. 76
  33. 70
  34. 90
  35. 56
  36. 56
  37. 72
  38. 122
  39. 128
  40. 62

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