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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 491 · 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 85 =
  2. 2.Double 53 =
  3. 3.Half of 34 =
  4. 4.Half of 32 =
  5. 5.Half of 38 =
  6. 6.Half of 184 =
  7. 7.Double 62 =
  8. 8.Double 43 =
  9. 9.Half of 122 =
  10. 10.Double 69 =
  11. 11.Half of 126 =
  12. 12.Double 79 =
  13. 13.Half of 72 =
  14. 14.Half of 132 =
  15. 15.Double 81 =
  16. 16.Double 19 =
  17. 17.Double 33 =
  18. 18.Half of 142 =
  19. 19.Half of 44 =
  20. 20.Double 16 =
  21. 21.Half of 28 =
  22. 22.Half of 140 =
  23. 23.Half of 130 =
  24. 24.Double 56 =
  25. 25.Double 18 =
  26. 26.Double 98 =
  27. 27.Double 17 =
  28. 28.Double 41 =
  29. 29.Half of 136 =
  30. 30.Double 35 =
  31. 31.Half of 108 =
  32. 32.Half of 178 =
  33. 33.Half of 172 =
  34. 34.Half of 30 =
  35. 35.Half of 138 =
  36. 36.Half of 102 =
  37. 37.Half of 48 =
  38. 38.Double 75 =
  39. 39.Double 32 =
  40. 40.Double 84 =

Answer key

  1. 170
  2. 106
  3. 17
  4. 16
  5. 19
  6. 92
  7. 124
  8. 86
  9. 61
  10. 138
  11. 63
  12. 158
  13. 36
  14. 66
  15. 162
  16. 38
  17. 66
  18. 71
  19. 22
  20. 32
  21. 14
  22. 70
  23. 65
  24. 112
  25. 36
  26. 196
  27. 34
  28. 82
  29. 68
  30. 70
  31. 54
  32. 89
  33. 86
  34. 15
  35. 69
  36. 51
  37. 24
  38. 150
  39. 64
  40. 168

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