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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 381 · 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 35 =
  2. 2.Double 51 =
  3. 3.Double 84 =
  4. 4.Double 31 =
  5. 5.Double 82 =
  6. 6.Double 54 =
  7. 7.Half of 102 =
  8. 8.Double 48 =
  9. 9.Double 77 =
  10. 10.Half of 118 =
  11. 11.Double 18 =
  12. 12.Half of 176 =
  13. 13.Double 44 =
  14. 14.Half of 196 =
  15. 15.Double 24 =
  16. 16.Half of 170 =
  17. 17.Half of 132 =
  18. 18.Half of 178 =
  19. 19.Double 94 =
  20. 20.Double 96 =
  21. 21.Double 74 =
  22. 22.Double 16 =
  23. 23.Double 71 =
  24. 24.Double 55 =
  25. 25.Double 72 =
  26. 26.Half of 42 =
  27. 27.Double 86 =
  28. 28.Half of 136 =
  29. 29.Half of 72 =
  30. 30.Half of 40 =
  31. 31.Half of 74 =
  32. 32.Half of 164 =
  33. 33.Double 17 =
  34. 34.Double 57 =
  35. 35.Half of 144 =
  36. 36.Double 66 =
  37. 37.Half of 46 =
  38. 38.Double 98 =
  39. 39.Double 21 =
  40. 40.Half of 160 =

Answer key

  1. 70
  2. 102
  3. 168
  4. 62
  5. 164
  6. 108
  7. 51
  8. 96
  9. 154
  10. 59
  11. 36
  12. 88
  13. 88
  14. 98
  15. 48
  16. 85
  17. 66
  18. 89
  19. 188
  20. 192
  21. 148
  22. 32
  23. 142
  24. 110
  25. 144
  26. 21
  27. 172
  28. 68
  29. 36
  30. 20
  31. 37
  32. 82
  33. 34
  34. 114
  35. 72
  36. 132
  37. 23
  38. 196
  39. 42
  40. 80

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