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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 187 · 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 17 =
  2. 2.Half of 112 =
  3. 3.Double 27 =
  4. 4.Double 58 =
  5. 5.Half of 76 =
  6. 6.Half of 56 =
  7. 7.Double 95 =
  8. 8.Double 83 =
  9. 9.Half of 132 =
  10. 10.Double 46 =
  11. 11.Double 74 =
  12. 12.Double 35 =
  13. 13.Half of 192 =
  14. 14.Double 26 =
  15. 15.Half of 128 =
  16. 16.Double 21 =
  17. 17.Half of 146 =
  18. 18.Half of 122 =
  19. 19.Double 55 =
  20. 20.Double 24 =
  21. 21.Double 18 =
  22. 22.Half of 168 =
  23. 23.Double 91 =
  24. 24.Double 69 =
  25. 25.Half of 194 =
  26. 26.Half of 34 =
  27. 27.Half of 94 =
  28. 28.Half of 150 =
  29. 29.Half of 144 =
  30. 30.Double 77 =
  31. 31.Half of 54 =
  32. 32.Half of 32 =
  33. 33.Half of 100 =
  34. 34.Half of 184 =
  35. 35.Double 76 =
  36. 36.Double 97 =
  37. 37.Half of 152 =
  38. 38.Half of 30 =
  39. 39.Double 64 =
  40. 40.Half of 72 =

Answer key

  1. 34
  2. 56
  3. 54
  4. 116
  5. 38
  6. 28
  7. 190
  8. 166
  9. 66
  10. 92
  11. 148
  12. 70
  13. 96
  14. 52
  15. 64
  16. 42
  17. 73
  18. 61
  19. 110
  20. 48
  21. 36
  22. 84
  23. 182
  24. 138
  25. 97
  26. 17
  27. 47
  28. 75
  29. 72
  30. 154
  31. 27
  32. 16
  33. 50
  34. 92
  35. 152
  36. 194
  37. 76
  38. 15
  39. 128
  40. 36

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