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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 86 · 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 16 =
  2. 2.Half of 98 =
  3. 3.Double 91 =
  4. 4.Half of 178 =
  5. 5.Double 51 =
  6. 6.Double 74 =
  7. 7.Double 78 =
  8. 8.Half of 194 =
  9. 9.Half of 196 =
  10. 10.Half of 190 =
  11. 11.Half of 126 =
  12. 12.Double 27 =
  13. 13.Half of 86 =
  14. 14.Double 48 =
  15. 15.Half of 70 =
  16. 16.Half of 152 =
  17. 17.Half of 188 =
  18. 18.Double 83 =
  19. 19.Half of 78 =
  20. 20.Double 21 =
  21. 21.Half of 180 =
  22. 22.Half of 72 =
  23. 23.Double 23 =
  24. 24.Double 57 =
  25. 25.Double 71 =
  26. 26.Double 99 =
  27. 27.Double 52 =
  28. 28.Half of 118 =
  29. 29.Half of 80 =
  30. 30.Half of 138 =
  31. 31.Half of 32 =
  32. 32.Half of 144 =
  33. 33.Double 35 =
  34. 34.Half of 122 =
  35. 35.Half of 198 =
  36. 36.Half of 26 =
  37. 37.Half of 46 =
  38. 38.Half of 146 =
  39. 39.Double 62 =
  40. 40.Double 92 =

Answer key

  1. 32
  2. 49
  3. 182
  4. 89
  5. 102
  6. 148
  7. 156
  8. 97
  9. 98
  10. 95
  11. 63
  12. 54
  13. 43
  14. 96
  15. 35
  16. 76
  17. 94
  18. 166
  19. 39
  20. 42
  21. 90
  22. 36
  23. 46
  24. 114
  25. 142
  26. 198
  27. 104
  28. 59
  29. 40
  30. 69
  31. 16
  32. 72
  33. 70
  34. 61
  35. 99
  36. 13
  37. 23
  38. 73
  39. 124
  40. 184

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