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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 58 · 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 86 =
  2. 2.Double 91 =
  3. 3.Double 76 =
  4. 4.Double 59 =
  5. 5.Double 16 =
  6. 6.Half of 32 =
  7. 7.Double 85 =
  8. 8.Double 89 =
  9. 9.Double 52 =
  10. 10.Double 24 =
  11. 11.Double 93 =
  12. 12.Half of 176 =
  13. 13.Double 94 =
  14. 14.Double 19 =
  15. 15.Half of 112 =
  16. 16.Double 23 =
  17. 17.Half of 76 =
  18. 18.Half of 182 =
  19. 19.Half of 132 =
  20. 20.Double 71 =
  21. 21.Double 34 =
  22. 22.Double 57 =
  23. 23.Half of 50 =
  24. 24.Double 33 =
  25. 25.Half of 80 =
  26. 26.Half of 58 =
  27. 27.Half of 126 =
  28. 28.Half of 180 =
  29. 29.Half of 46 =
  30. 30.Double 99 =
  31. 31.Half of 70 =
  32. 32.Half of 88 =
  33. 33.Half of 178 =
  34. 34.Half of 42 =
  35. 35.Double 61 =
  36. 36.Half of 128 =
  37. 37.Half of 118 =
  38. 38.Double 35 =
  39. 39.Half of 148 =
  40. 40.Half of 74 =

Answer key

  1. 43
  2. 182
  3. 152
  4. 118
  5. 32
  6. 16
  7. 170
  8. 178
  9. 104
  10. 48
  11. 186
  12. 88
  13. 188
  14. 38
  15. 56
  16. 46
  17. 38
  18. 91
  19. 66
  20. 142
  21. 68
  22. 114
  23. 25
  24. 66
  25. 40
  26. 29
  27. 63
  28. 90
  29. 23
  30. 198
  31. 35
  32. 44
  33. 89
  34. 21
  35. 122
  36. 64
  37. 59
  38. 70
  39. 74
  40. 37

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