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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 661 · 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 144 =
  2. 2.Double 47 =
  3. 3.Half of 170 =
  4. 4.Double 51 =
  5. 5.Half of 94 =
  6. 6.Double 31 =
  7. 7.Half of 44 =
  8. 8.Half of 86 =
  9. 9.Double 26 =
  10. 10.Half of 194 =
  11. 11.Double 19 =
  12. 12.Double 35 =
  13. 13.Half of 92 =
  14. 14.Half of 182 =
  15. 15.Double 45 =
  16. 16.Double 75 =
  17. 17.Half of 40 =
  18. 18.Half of 32 =
  19. 19.Double 57 =
  20. 20.Half of 108 =
  21. 21.Half of 98 =
  22. 22.Half of 134 =
  23. 23.Double 67 =
  24. 24.Double 88 =
  25. 25.Double 63 =
  26. 26.Double 18 =
  27. 27.Half of 84 =
  28. 28.Double 81 =
  29. 29.Double 84 =
  30. 30.Double 93 =
  31. 31.Double 64 =
  32. 32.Double 91 =
  33. 33.Half of 172 =
  34. 34.Half of 88 =
  35. 35.Half of 138 =
  36. 36.Double 72 =
  37. 37.Half of 70 =
  38. 38.Half of 126 =
  39. 39.Half of 154 =
  40. 40.Half of 50 =

Answer key

  1. 72
  2. 94
  3. 85
  4. 102
  5. 47
  6. 62
  7. 22
  8. 43
  9. 52
  10. 97
  11. 38
  12. 70
  13. 46
  14. 91
  15. 90
  16. 150
  17. 20
  18. 16
  19. 114
  20. 54
  21. 49
  22. 67
  23. 134
  24. 176
  25. 126
  26. 36
  27. 42
  28. 162
  29. 168
  30. 186
  31. 128
  32. 182
  33. 86
  34. 44
  35. 69
  36. 144
  37. 35
  38. 63
  39. 77
  40. 25

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