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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 335 · 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 66 =
  2. 2.Double 23 =
  3. 3.Double 97 =
  4. 4.Half of 174 =
  5. 5.Half of 58 =
  6. 6.Half of 112 =
  7. 7.Half of 116 =
  8. 8.Half of 110 =
  9. 9.Double 76 =
  10. 10.Half of 88 =
  11. 11.Double 31 =
  12. 12.Half of 86 =
  13. 13.Double 34 =
  14. 14.Double 22 =
  15. 15.Double 35 =
  16. 16.Double 73 =
  17. 17.Double 17 =
  18. 18.Half of 94 =
  19. 19.Half of 38 =
  20. 20.Half of 36 =
  21. 21.Half of 106 =
  22. 22.Half of 190 =
  23. 23.Half of 138 =
  24. 24.Half of 50 =
  25. 25.Half of 134 =
  26. 26.Double 65 =
  27. 27.Half of 144 =
  28. 28.Half of 122 =
  29. 29.Double 71 =
  30. 30.Double 61 =
  31. 31.Half of 152 =
  32. 32.Half of 140 =
  33. 33.Half of 80 =
  34. 34.Half of 92 =
  35. 35.Double 43 =
  36. 36.Half of 56 =
  37. 37.Double 75 =
  38. 38.Half of 74 =
  39. 39.Half of 132 =
  40. 40.Double 48 =

Answer key

  1. 132
  2. 46
  3. 194
  4. 87
  5. 29
  6. 56
  7. 58
  8. 55
  9. 152
  10. 44
  11. 62
  12. 43
  13. 68
  14. 44
  15. 70
  16. 146
  17. 34
  18. 47
  19. 19
  20. 18
  21. 53
  22. 95
  23. 69
  24. 25
  25. 67
  26. 130
  27. 72
  28. 61
  29. 142
  30. 122
  31. 76
  32. 70
  33. 40
  34. 46
  35. 86
  36. 28
  37. 150
  38. 37
  39. 66
  40. 96

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