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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 249 · 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 47 =
  2. 2.Double 89 =
  3. 3.Half of 196 =
  4. 4.Double 57 =
  5. 5.Double 68 =
  6. 6.Double 39 =
  7. 7.Half of 164 =
  8. 8.Double 26 =
  9. 9.Double 21 =
  10. 10.Half of 148 =
  11. 11.Double 84 =
  12. 12.Half of 158 =
  13. 13.Half of 184 =
  14. 14.Half of 68 =
  15. 15.Double 91 =
  16. 16.Double 46 =
  17. 17.Half of 120 =
  18. 18.Half of 128 =
  19. 19.Double 22 =
  20. 20.Double 93 =
  21. 21.Half of 176 =
  22. 22.Half of 52 =
  23. 23.Half of 172 =
  24. 24.Double 37 =
  25. 25.Half of 50 =
  26. 26.Half of 90 =
  27. 27.Half of 174 =
  28. 28.Half of 136 =
  29. 29.Half of 94 =
  30. 30.Half of 72 =
  31. 31.Double 92 =
  32. 32.Double 78 =
  33. 33.Double 27 =
  34. 34.Double 56 =
  35. 35.Double 73 =
  36. 36.Double 24 =
  37. 37.Half of 48 =
  38. 38.Double 74 =
  39. 39.Half of 42 =
  40. 40.Half of 168 =

Answer key

  1. 94
  2. 178
  3. 98
  4. 114
  5. 136
  6. 78
  7. 82
  8. 52
  9. 42
  10. 74
  11. 168
  12. 79
  13. 92
  14. 34
  15. 182
  16. 92
  17. 60
  18. 64
  19. 44
  20. 186
  21. 88
  22. 26
  23. 86
  24. 74
  25. 25
  26. 45
  27. 87
  28. 68
  29. 47
  30. 36
  31. 184
  32. 156
  33. 54
  34. 112
  35. 146
  36. 48
  37. 24
  38. 148
  39. 21
  40. 84

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