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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 702 · 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.Half of 30 =
  2. 2.Double 88 =
  3. 3.Double 44 =
  4. 4.Half of 114 =
  5. 5.Double 64 =
  6. 6.Double 91 =
  7. 7.Half of 28 =
  8. 8.Double 67 =
  9. 9.Half of 98 =
  10. 10.Double 89 =
  11. 11.Double 41 =
  12. 12.Double 99 =
  13. 13.Half of 80 =
  14. 14.Half of 52 =
  15. 15.Double 66 =
  16. 16.Double 26 =
  17. 17.Half of 118 =
  18. 18.Double 57 =
  19. 19.Half of 50 =
  20. 20.Double 92 =
  21. 21.Double 54 =
  22. 22.Half of 160 =
  23. 23.Double 73 =
  24. 24.Double 31 =
  25. 25.Half of 122 =
  26. 26.Half of 190 =
  27. 27.Half of 104 =
  28. 28.Half of 194 =
  29. 29.Half of 132 =
  30. 30.Double 56 =
  31. 31.Half of 174 =
  32. 32.Half of 140 =
  33. 33.Double 87 =
  34. 34.Half of 156 =
  35. 35.Double 93 =
  36. 36.Half of 34 =
  37. 37.Double 37 =
  38. 38.Half of 36 =
  39. 39.Double 51 =
  40. 40.Half of 94 =

Answer key

  1. 15
  2. 176
  3. 88
  4. 57
  5. 128
  6. 182
  7. 14
  8. 134
  9. 49
  10. 178
  11. 82
  12. 198
  13. 40
  14. 26
  15. 132
  16. 52
  17. 59
  18. 114
  19. 25
  20. 184
  21. 108
  22. 80
  23. 146
  24. 62
  25. 61
  26. 95
  27. 52
  28. 97
  29. 66
  30. 112
  31. 87
  32. 70
  33. 174
  34. 78
  35. 186
  36. 17
  37. 74
  38. 18
  39. 102
  40. 47

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