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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 191 · 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 88 =
  2. 2.Double 71 =
  3. 3.Half of 114 =
  4. 4.Half of 146 =
  5. 5.Double 91 =
  6. 6.Double 68 =
  7. 7.Double 78 =
  8. 8.Half of 80 =
  9. 9.Half of 90 =
  10. 10.Half of 56 =
  11. 11.Double 51 =
  12. 12.Double 38 =
  13. 13.Double 55 =
  14. 14.Double 57 =
  15. 15.Half of 140 =
  16. 16.Half of 122 =
  17. 17.Double 79 =
  18. 18.Double 43 =
  19. 19.Double 98 =
  20. 20.Double 16 =
  21. 21.Half of 60 =
  22. 22.Double 53 =
  23. 23.Half of 102 =
  24. 24.Double 94 =
  25. 25.Half of 182 =
  26. 26.Half of 100 =
  27. 27.Half of 168 =
  28. 28.Double 25 =
  29. 29.Double 44 =
  30. 30.Half of 184 =
  31. 31.Double 92 =
  32. 32.Half of 156 =
  33. 33.Double 35 =
  34. 34.Half of 190 =
  35. 35.Half of 62 =
  36. 36.Double 72 =
  37. 37.Half of 174 =
  38. 38.Half of 54 =
  39. 39.Half of 32 =
  40. 40.Double 37 =

Answer key

  1. 176
  2. 142
  3. 57
  4. 73
  5. 182
  6. 136
  7. 156
  8. 40
  9. 45
  10. 28
  11. 102
  12. 76
  13. 110
  14. 114
  15. 70
  16. 61
  17. 158
  18. 86
  19. 196
  20. 32
  21. 30
  22. 106
  23. 51
  24. 188
  25. 91
  26. 50
  27. 84
  28. 50
  29. 88
  30. 92
  31. 184
  32. 78
  33. 70
  34. 95
  35. 31
  36. 144
  37. 87
  38. 27
  39. 16
  40. 74

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