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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 190 · 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 38 =
  2. 2.Half of 94 =
  3. 3.Double 32 =
  4. 4.Half of 154 =
  5. 5.Double 31 =
  6. 6.Half of 156 =
  7. 7.Double 59 =
  8. 8.Double 58 =
  9. 9.Double 43 =
  10. 10.Half of 38 =
  11. 11.Double 64 =
  12. 12.Double 19 =
  13. 13.Double 57 =
  14. 14.Double 27 =
  15. 15.Double 86 =
  16. 16.Double 33 =
  17. 17.Half of 124 =
  18. 18.Half of 196 =
  19. 19.Half of 86 =
  20. 20.Double 29 =
  21. 21.Half of 76 =
  22. 22.Half of 160 =
  23. 23.Double 93 =
  24. 24.Double 16 =
  25. 25.Half of 72 =
  26. 26.Double 84 =
  27. 27.Half of 148 =
  28. 28.Double 22 =
  29. 29.Half of 50 =
  30. 30.Double 61 =
  31. 31.Half of 144 =
  32. 32.Half of 114 =
  33. 33.Half of 68 =
  34. 34.Double 24 =
  35. 35.Double 71 =
  36. 36.Half of 42 =
  37. 37.Double 83 =
  38. 38.Half of 74 =
  39. 39.Double 46 =
  40. 40.Half of 184 =

Answer key

  1. 76
  2. 47
  3. 64
  4. 77
  5. 62
  6. 78
  7. 118
  8. 116
  9. 86
  10. 19
  11. 128
  12. 38
  13. 114
  14. 54
  15. 172
  16. 66
  17. 62
  18. 98
  19. 43
  20. 58
  21. 38
  22. 80
  23. 186
  24. 32
  25. 36
  26. 168
  27. 74
  28. 44
  29. 25
  30. 122
  31. 72
  32. 57
  33. 34
  34. 48
  35. 142
  36. 21
  37. 166
  38. 37
  39. 92
  40. 92

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