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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 308 · 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 54 =
  2. 2.Half of 80 =
  3. 3.Double 88 =
  4. 4.Double 34 =
  5. 5.Half of 88 =
  6. 6.Half of 108 =
  7. 7.Double 46 =
  8. 8.Double 58 =
  9. 9.Double 29 =
  10. 10.Half of 178 =
  11. 11.Half of 148 =
  12. 12.Half of 184 =
  13. 13.Half of 40 =
  14. 14.Double 64 =
  15. 15.Double 76 =
  16. 16.Double 31 =
  17. 17.Half of 30 =
  18. 18.Half of 110 =
  19. 19.Half of 48 =
  20. 20.Double 89 =
  21. 21.Double 28 =
  22. 22.Half of 96 =
  23. 23.Double 53 =
  24. 24.Double 99 =
  25. 25.Half of 44 =
  26. 26.Half of 86 =
  27. 27.Double 56 =
  28. 28.Double 33 =
  29. 29.Half of 60 =
  30. 30.Double 69 =
  31. 31.Half of 42 =
  32. 32.Half of 114 =
  33. 33.Double 97 =
  34. 34.Double 77 =
  35. 35.Half of 130 =
  36. 36.Half of 146 =
  37. 37.Double 62 =
  38. 38.Half of 32 =
  39. 39.Half of 66 =
  40. 40.Double 91 =

Answer key

  1. 27
  2. 40
  3. 176
  4. 68
  5. 44
  6. 54
  7. 92
  8. 116
  9. 58
  10. 89
  11. 74
  12. 92
  13. 20
  14. 128
  15. 152
  16. 62
  17. 15
  18. 55
  19. 24
  20. 178
  21. 56
  22. 48
  23. 106
  24. 198
  25. 22
  26. 43
  27. 112
  28. 66
  29. 30
  30. 138
  31. 21
  32. 57
  33. 194
  34. 154
  35. 65
  36. 73
  37. 124
  38. 16
  39. 33
  40. 182

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