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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 720 · 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.Double 93 =
  3. 3.Double 78 =
  4. 4.Double 51 =
  5. 5.Double 97 =
  6. 6.Half of 178 =
  7. 7.Double 36 =
  8. 8.Half of 36 =
  9. 9.Double 55 =
  10. 10.Double 16 =
  11. 11.Half of 164 =
  12. 12.Double 23 =
  13. 13.Half of 196 =
  14. 14.Double 52 =
  15. 15.Half of 56 =
  16. 16.Half of 148 =
  17. 17.Double 91 =
  18. 18.Half of 122 =
  19. 19.Double 89 =
  20. 20.Half of 120 =
  21. 21.Double 34 =
  22. 22.Double 41 =
  23. 23.Double 35 =
  24. 24.Double 49 =
  25. 25.Half of 46 =
  26. 26.Half of 90 =
  27. 27.Double 54 =
  28. 28.Double 87 =
  29. 29.Double 64 =
  30. 30.Half of 28 =
  31. 31.Double 66 =
  32. 32.Double 83 =
  33. 33.Half of 116 =
  34. 34.Half of 170 =
  35. 35.Half of 114 =
  36. 36.Double 26 =
  37. 37.Double 21 =
  38. 38.Half of 146 =
  39. 39.Double 79 =
  40. 40.Double 56 =

Answer key

  1. 148
  2. 186
  3. 156
  4. 102
  5. 194
  6. 89
  7. 72
  8. 18
  9. 110
  10. 32
  11. 82
  12. 46
  13. 98
  14. 104
  15. 28
  16. 74
  17. 182
  18. 61
  19. 178
  20. 60
  21. 68
  22. 82
  23. 70
  24. 98
  25. 23
  26. 45
  27. 108
  28. 174
  29. 128
  30. 14
  31. 132
  32. 166
  33. 58
  34. 85
  35. 57
  36. 52
  37. 42
  38. 73
  39. 158
  40. 112

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