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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 203 · 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 51 =
  2. 2.Double 19 =
  3. 3.Half of 156 =
  4. 4.Double 44 =
  5. 5.Half of 146 =
  6. 6.Double 88 =
  7. 7.Half of 196 =
  8. 8.Half of 72 =
  9. 9.Half of 56 =
  10. 10.Double 54 =
  11. 11.Half of 132 =
  12. 12.Double 56 =
  13. 13.Double 35 =
  14. 14.Half of 48 =
  15. 15.Half of 32 =
  16. 16.Double 65 =
  17. 17.Half of 160 =
  18. 18.Double 34 =
  19. 19.Double 16 =
  20. 20.Double 59 =
  21. 21.Double 57 =
  22. 22.Half of 78 =
  23. 23.Half of 116 =
  24. 24.Double 64 =
  25. 25.Half of 68 =
  26. 26.Double 97 =
  27. 27.Half of 148 =
  28. 28.Double 82 =
  29. 29.Double 81 =
  30. 30.Double 22 =
  31. 31.Half of 42 =
  32. 32.Half of 126 =
  33. 33.Half of 154 =
  34. 34.Half of 80 =
  35. 35.Double 71 =
  36. 36.Double 28 =
  37. 37.Half of 134 =
  38. 38.Double 38 =
  39. 39.Double 17 =
  40. 40.Half of 58 =

Answer key

  1. 102
  2. 38
  3. 78
  4. 88
  5. 73
  6. 176
  7. 98
  8. 36
  9. 28
  10. 108
  11. 66
  12. 112
  13. 70
  14. 24
  15. 16
  16. 130
  17. 80
  18. 68
  19. 32
  20. 118
  21. 114
  22. 39
  23. 58
  24. 128
  25. 34
  26. 194
  27. 74
  28. 164
  29. 162
  30. 44
  31. 21
  32. 63
  33. 77
  34. 40
  35. 142
  36. 56
  37. 67
  38. 76
  39. 34
  40. 29

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