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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 145 · 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 27 =
  2. 2.Double 99 =
  3. 3.Half of 182 =
  4. 4.Half of 152 =
  5. 5.Double 28 =
  6. 6.Double 47 =
  7. 7.Double 25 =
  8. 8.Double 48 =
  9. 9.Half of 126 =
  10. 10.Double 44 =
  11. 11.Half of 64 =
  12. 12.Double 78 =
  13. 13.Half of 172 =
  14. 14.Double 75 =
  15. 15.Double 34 =
  16. 16.Half of 100 =
  17. 17.Double 83 =
  18. 18.Half of 128 =
  19. 19.Double 31 =
  20. 20.Half of 42 =
  21. 21.Half of 134 =
  22. 22.Double 62 =
  23. 23.Double 45 =
  24. 24.Double 36 =
  25. 25.Double 42 =
  26. 26.Double 92 =
  27. 27.Half of 28 =
  28. 28.Double 94 =
  29. 29.Half of 86 =
  30. 30.Double 95 =
  31. 31.Half of 180 =
  32. 32.Double 93 =
  33. 33.Double 37 =
  34. 34.Half of 96 =
  35. 35.Half of 140 =
  36. 36.Double 73 =
  37. 37.Double 71 =
  38. 38.Half of 40 =
  39. 39.Half of 190 =
  40. 40.Double 35 =

Answer key

  1. 54
  2. 198
  3. 91
  4. 76
  5. 56
  6. 94
  7. 50
  8. 96
  9. 63
  10. 88
  11. 32
  12. 156
  13. 86
  14. 150
  15. 68
  16. 50
  17. 166
  18. 64
  19. 62
  20. 21
  21. 67
  22. 124
  23. 90
  24. 72
  25. 84
  26. 184
  27. 14
  28. 188
  29. 43
  30. 190
  31. 90
  32. 186
  33. 74
  34. 48
  35. 70
  36. 146
  37. 142
  38. 20
  39. 95
  40. 70

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