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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 657 · 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 40 =
  2. 2.Double 62 =
  3. 3.Double 75 =
  4. 4.Double 51 =
  5. 5.Double 17 =
  6. 6.Double 67 =
  7. 7.Half of 76 =
  8. 8.Half of 178 =
  9. 9.Double 72 =
  10. 10.Double 76 =
  11. 11.Double 18 =
  12. 12.Half of 84 =
  13. 13.Double 97 =
  14. 14.Double 28 =
  15. 15.Half of 112 =
  16. 16.Half of 120 =
  17. 17.Half of 94 =
  18. 18.Double 87 =
  19. 19.Double 71 =
  20. 20.Double 82 =
  21. 21.Half of 180 =
  22. 22.Half of 128 =
  23. 23.Double 84 =
  24. 24.Half of 34 =
  25. 25.Double 25 =
  26. 26.Half of 64 =
  27. 27.Double 65 =
  28. 28.Double 31 =
  29. 29.Half of 56 =
  30. 30.Half of 88 =
  31. 31.Half of 52 =
  32. 32.Half of 92 =
  33. 33.Double 98 =
  34. 34.Half of 176 =
  35. 35.Half of 122 =
  36. 36.Double 36 =
  37. 37.Double 33 =
  38. 38.Double 19 =
  39. 39.Double 38 =
  40. 40.Half of 148 =

Answer key

  1. 20
  2. 124
  3. 150
  4. 102
  5. 34
  6. 134
  7. 38
  8. 89
  9. 144
  10. 152
  11. 36
  12. 42
  13. 194
  14. 56
  15. 56
  16. 60
  17. 47
  18. 174
  19. 142
  20. 164
  21. 90
  22. 64
  23. 168
  24. 17
  25. 50
  26. 32
  27. 130
  28. 62
  29. 28
  30. 44
  31. 26
  32. 46
  33. 196
  34. 88
  35. 61
  36. 72
  37. 66
  38. 38
  39. 76
  40. 74

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