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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 169 · 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 78 =
  2. 2.Half of 154 =
  3. 3.Half of 90 =
  4. 4.Double 48 =
  5. 5.Double 77 =
  6. 6.Half of 26 =
  7. 7.Half of 130 =
  8. 8.Half of 38 =
  9. 9.Double 97 =
  10. 10.Double 65 =
  11. 11.Double 43 =
  12. 12.Half of 98 =
  13. 13.Double 46 =
  14. 14.Double 51 =
  15. 15.Double 38 =
  16. 16.Double 76 =
  17. 17.Double 71 =
  18. 18.Half of 80 =
  19. 19.Half of 64 =
  20. 20.Half of 146 =
  21. 21.Double 73 =
  22. 22.Double 74 =
  23. 23.Double 93 =
  24. 24.Double 72 =
  25. 25.Half of 158 =
  26. 26.Half of 58 =
  27. 27.Double 31 =
  28. 28.Half of 92 =
  29. 29.Double 66 =
  30. 30.Half of 76 =
  31. 31.Double 26 =
  32. 32.Half of 140 =
  33. 33.Double 25 =
  34. 34.Double 53 =
  35. 35.Half of 94 =
  36. 36.Double 81 =
  37. 37.Double 23 =
  38. 38.Half of 152 =
  39. 39.Double 98 =
  40. 40.Double 64 =

Answer key

  1. 39
  2. 77
  3. 45
  4. 96
  5. 154
  6. 13
  7. 65
  8. 19
  9. 194
  10. 130
  11. 86
  12. 49
  13. 92
  14. 102
  15. 76
  16. 152
  17. 142
  18. 40
  19. 32
  20. 73
  21. 146
  22. 148
  23. 186
  24. 144
  25. 79
  26. 29
  27. 62
  28. 46
  29. 132
  30. 38
  31. 52
  32. 70
  33. 50
  34. 106
  35. 47
  36. 162
  37. 46
  38. 76
  39. 196
  40. 128

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