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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 3 · 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 190 =
  2. 2.Double 98 =
  3. 3.Half of 194 =
  4. 4.Half of 96 =
  5. 5.Double 51 =
  6. 6.Double 65 =
  7. 7.Double 68 =
  8. 8.Half of 124 =
  9. 9.Half of 28 =
  10. 10.Double 18 =
  11. 11.Double 67 =
  12. 12.Half of 42 =
  13. 13.Half of 44 =
  14. 14.Half of 100 =
  15. 15.Double 37 =
  16. 16.Half of 56 =
  17. 17.Double 21 =
  18. 18.Half of 148 =
  19. 19.Double 59 =
  20. 20.Double 26 =
  21. 21.Half of 172 =
  22. 22.Half of 116 =
  23. 23.Half of 182 =
  24. 24.Double 36 =
  25. 25.Double 22 =
  26. 26.Double 41 =
  27. 27.Double 66 =
  28. 28.Double 49 =
  29. 29.Half of 76 =
  30. 30.Double 35 =
  31. 31.Half of 34 =
  32. 32.Half of 80 =
  33. 33.Half of 32 =
  34. 34.Double 69 =
  35. 35.Half of 192 =
  36. 36.Half of 40 =
  37. 37.Half of 64 =
  38. 38.Half of 82 =
  39. 39.Double 63 =
  40. 40.Double 32 =

Answer key

  1. 95
  2. 196
  3. 97
  4. 48
  5. 102
  6. 130
  7. 136
  8. 62
  9. 14
  10. 36
  11. 134
  12. 21
  13. 22
  14. 50
  15. 74
  16. 28
  17. 42
  18. 74
  19. 118
  20. 52
  21. 86
  22. 58
  23. 91
  24. 72
  25. 44
  26. 82
  27. 132
  28. 98
  29. 38
  30. 70
  31. 17
  32. 40
  33. 16
  34. 138
  35. 96
  36. 20
  37. 32
  38. 41
  39. 126
  40. 64

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