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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 33 · 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 74 =
  2. 2.Half of 170 =
  3. 3.Half of 66 =
  4. 4.Double 53 =
  5. 5.Half of 96 =
  6. 6.Double 63 =
  7. 7.Double 81 =
  8. 8.Half of 174 =
  9. 9.Double 49 =
  10. 10.Half of 80 =
  11. 11.Half of 86 =
  12. 12.Half of 98 =
  13. 13.Double 31 =
  14. 14.Half of 126 =
  15. 15.Double 21 =
  16. 16.Double 67 =
  17. 17.Half of 172 =
  18. 18.Double 22 =
  19. 19.Double 52 =
  20. 20.Double 61 =
  21. 21.Double 27 =
  22. 22.Double 62 =
  23. 23.Double 94 =
  24. 24.Double 26 =
  25. 25.Half of 158 =
  26. 26.Double 36 =
  27. 27.Double 66 =
  28. 28.Half of 106 =
  29. 29.Half of 190 =
  30. 30.Double 84 =
  31. 31.Double 69 =
  32. 32.Half of 142 =
  33. 33.Double 85 =
  34. 34.Double 43 =
  35. 35.Half of 146 =
  36. 36.Half of 30 =
  37. 37.Double 42 =
  38. 38.Half of 118 =
  39. 39.Double 64 =
  40. 40.Double 88 =

Answer key

  1. 148
  2. 85
  3. 33
  4. 106
  5. 48
  6. 126
  7. 162
  8. 87
  9. 98
  10. 40
  11. 43
  12. 49
  13. 62
  14. 63
  15. 42
  16. 134
  17. 86
  18. 44
  19. 104
  20. 122
  21. 54
  22. 124
  23. 188
  24. 52
  25. 79
  26. 72
  27. 132
  28. 53
  29. 95
  30. 168
  31. 138
  32. 71
  33. 170
  34. 86
  35. 73
  36. 15
  37. 84
  38. 59
  39. 128
  40. 176

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