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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 672 · 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 40 =
  2. 2.Half of 94 =
  3. 3.Double 61 =
  4. 4.Half of 38 =
  5. 5.Double 29 =
  6. 6.Half of 64 =
  7. 7.Double 88 =
  8. 8.Double 42 =
  9. 9.Double 74 =
  10. 10.Half of 54 =
  11. 11.Half of 140 =
  12. 12.Half of 172 =
  13. 13.Half of 126 =
  14. 14.Half of 182 =
  15. 15.Half of 190 =
  16. 16.Half of 188 =
  17. 17.Half of 120 =
  18. 18.Half of 114 =
  19. 19.Double 24 =
  20. 20.Double 22 =
  21. 21.Half of 78 =
  22. 22.Half of 130 =
  23. 23.Double 17 =
  24. 24.Double 49 =
  25. 25.Half of 158 =
  26. 26.Double 33 =
  27. 27.Half of 118 =
  28. 28.Half of 160 =
  29. 29.Half of 106 =
  30. 30.Half of 26 =
  31. 31.Half of 50 =
  32. 32.Half of 72 =
  33. 33.Double 97 =
  34. 34.Double 73 =
  35. 35.Double 91 =
  36. 36.Half of 144 =
  37. 37.Double 21 =
  38. 38.Half of 80 =
  39. 39.Half of 184 =
  40. 40.Half of 32 =

Answer key

  1. 20
  2. 47
  3. 122
  4. 19
  5. 58
  6. 32
  7. 176
  8. 84
  9. 148
  10. 27
  11. 70
  12. 86
  13. 63
  14. 91
  15. 95
  16. 94
  17. 60
  18. 57
  19. 48
  20. 44
  21. 39
  22. 65
  23. 34
  24. 98
  25. 79
  26. 66
  27. 59
  28. 80
  29. 53
  30. 13
  31. 25
  32. 36
  33. 194
  34. 146
  35. 182
  36. 72
  37. 42
  38. 40
  39. 92
  40. 16

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