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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 161 · 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 64 =
  2. 2.Double 95 =
  3. 3.Half of 102 =
  4. 4.Double 71 =
  5. 5.Half of 134 =
  6. 6.Half of 52 =
  7. 7.Double 42 =
  8. 8.Double 33 =
  9. 9.Half of 36 =
  10. 10.Half of 94 =
  11. 11.Half of 70 =
  12. 12.Double 32 =
  13. 13.Double 41 =
  14. 14.Double 73 =
  15. 15.Double 68 =
  16. 16.Double 96 =
  17. 17.Double 35 =
  18. 18.Half of 186 =
  19. 19.Half of 176 =
  20. 20.Half of 192 =
  21. 21.Double 44 =
  22. 22.Double 34 =
  23. 23.Half of 80 =
  24. 24.Double 26 =
  25. 25.Double 22 =
  26. 26.Half of 56 =
  27. 27.Half of 104 =
  28. 28.Double 84 =
  29. 29.Half of 118 =
  30. 30.Half of 108 =
  31. 31.Double 38 =
  32. 32.Half of 120 =
  33. 33.Double 62 =
  34. 34.Double 27 =
  35. 35.Double 17 =
  36. 36.Half of 68 =
  37. 37.Double 49 =
  38. 38.Half of 162 =
  39. 39.Half of 148 =
  40. 40.Double 21 =

Answer key

  1. 128
  2. 190
  3. 51
  4. 142
  5. 67
  6. 26
  7. 84
  8. 66
  9. 18
  10. 47
  11. 35
  12. 64
  13. 82
  14. 146
  15. 136
  16. 192
  17. 70
  18. 93
  19. 88
  20. 96
  21. 88
  22. 68
  23. 40
  24. 52
  25. 44
  26. 28
  27. 52
  28. 168
  29. 59
  30. 54
  31. 76
  32. 60
  33. 124
  34. 54
  35. 34
  36. 34
  37. 98
  38. 81
  39. 74
  40. 42

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