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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 389 · 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 59 =
  2. 2.Double 33 =
  3. 3.Double 45 =
  4. 4.Double 86 =
  5. 5.Double 62 =
  6. 6.Double 58 =
  7. 7.Half of 30 =
  8. 8.Half of 140 =
  9. 9.Double 43 =
  10. 10.Half of 166 =
  11. 11.Double 61 =
  12. 12.Double 46 =
  13. 13.Double 36 =
  14. 14.Half of 70 =
  15. 15.Double 16 =
  16. 16.Half of 42 =
  17. 17.Half of 126 =
  18. 18.Half of 180 =
  19. 19.Half of 34 =
  20. 20.Half of 98 =
  21. 21.Half of 88 =
  22. 22.Double 28 =
  23. 23.Double 42 =
  24. 24.Double 17 =
  25. 25.Half of 52 =
  26. 26.Half of 110 =
  27. 27.Half of 188 =
  28. 28.Half of 130 =
  29. 29.Double 73 =
  30. 30.Half of 146 =
  31. 31.Double 29 =
  32. 32.Double 81 =
  33. 33.Double 56 =
  34. 34.Half of 162 =
  35. 35.Double 35 =
  36. 36.Half of 168 =
  37. 37.Half of 186 =
  38. 38.Double 96 =
  39. 39.Half of 44 =
  40. 40.Double 41 =

Answer key

  1. 118
  2. 66
  3. 90
  4. 172
  5. 124
  6. 116
  7. 15
  8. 70
  9. 86
  10. 83
  11. 122
  12. 92
  13. 72
  14. 35
  15. 32
  16. 21
  17. 63
  18. 90
  19. 17
  20. 49
  21. 44
  22. 56
  23. 84
  24. 34
  25. 26
  26. 55
  27. 94
  28. 65
  29. 146
  30. 73
  31. 58
  32. 162
  33. 112
  34. 81
  35. 70
  36. 84
  37. 93
  38. 192
  39. 22
  40. 82

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