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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 175 · 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 99 =
  2. 2.Double 29 =
  3. 3.Half of 152 =
  4. 4.Double 45 =
  5. 5.Half of 148 =
  6. 6.Double 31 =
  7. 7.Double 24 =
  8. 8.Half of 86 =
  9. 9.Double 87 =
  10. 10.Double 47 =
  11. 11.Double 75 =
  12. 12.Half of 176 =
  13. 13.Half of 128 =
  14. 14.Double 52 =
  15. 15.Double 86 =
  16. 16.Half of 158 =
  17. 17.Double 62 =
  18. 18.Half of 160 =
  19. 19.Double 69 =
  20. 20.Double 17 =
  21. 21.Double 58 =
  22. 22.Double 83 =
  23. 23.Double 67 =
  24. 24.Double 59 =
  25. 25.Half of 182 =
  26. 26.Double 68 =
  27. 27.Half of 92 =
  28. 28.Half of 46 =
  29. 29.Half of 106 =
  30. 30.Double 51 =
  31. 31.Half of 48 =
  32. 32.Double 26 =
  33. 33.Double 81 =
  34. 34.Double 16 =
  35. 35.Half of 122 =
  36. 36.Half of 100 =
  37. 37.Half of 136 =
  38. 38.Double 32 =
  39. 39.Half of 138 =
  40. 40.Half of 144 =

Answer key

  1. 198
  2. 58
  3. 76
  4. 90
  5. 74
  6. 62
  7. 48
  8. 43
  9. 174
  10. 94
  11. 150
  12. 88
  13. 64
  14. 104
  15. 172
  16. 79
  17. 124
  18. 80
  19. 138
  20. 34
  21. 116
  22. 166
  23. 134
  24. 118
  25. 91
  26. 136
  27. 46
  28. 23
  29. 53
  30. 102
  31. 24
  32. 52
  33. 162
  34. 32
  35. 61
  36. 50
  37. 68
  38. 64
  39. 69
  40. 72

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