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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 468 · 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 17 =
  2. 2.Half of 70 =
  3. 3.Half of 26 =
  4. 4.Half of 56 =
  5. 5.Half of 192 =
  6. 6.Double 88 =
  7. 7.Double 57 =
  8. 8.Double 81 =
  9. 9.Double 46 =
  10. 10.Half of 176 =
  11. 11.Half of 152 =
  12. 12.Double 62 =
  13. 13.Double 71 =
  14. 14.Double 21 =
  15. 15.Half of 118 =
  16. 16.Double 53 =
  17. 17.Half of 90 =
  18. 18.Half of 46 =
  19. 19.Double 37 =
  20. 20.Double 23 =
  21. 21.Half of 190 =
  22. 22.Half of 182 =
  23. 23.Half of 42 =
  24. 24.Half of 32 =
  25. 25.Half of 54 =
  26. 26.Half of 142 =
  27. 27.Half of 166 =
  28. 28.Double 97 =
  29. 29.Double 61 =
  30. 30.Double 66 =
  31. 31.Half of 128 =
  32. 32.Double 74 =
  33. 33.Double 48 =
  34. 34.Half of 62 =
  35. 35.Half of 40 =
  36. 36.Half of 144 =
  37. 37.Half of 36 =
  38. 38.Double 92 =
  39. 39.Half of 66 =
  40. 40.Double 59 =

Answer key

  1. 34
  2. 35
  3. 13
  4. 28
  5. 96
  6. 176
  7. 114
  8. 162
  9. 92
  10. 88
  11. 76
  12. 124
  13. 142
  14. 42
  15. 59
  16. 106
  17. 45
  18. 23
  19. 74
  20. 46
  21. 95
  22. 91
  23. 21
  24. 16
  25. 27
  26. 71
  27. 83
  28. 194
  29. 122
  30. 132
  31. 64
  32. 148
  33. 96
  34. 31
  35. 20
  36. 72
  37. 18
  38. 184
  39. 33
  40. 118

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