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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 118 · 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 146 =
  2. 2.Double 34 =
  3. 3.Double 16 =
  4. 4.Double 76 =
  5. 5.Double 79 =
  6. 6.Double 94 =
  7. 7.Double 18 =
  8. 8.Double 44 =
  9. 9.Double 74 =
  10. 10.Double 29 =
  11. 11.Double 98 =
  12. 12.Half of 110 =
  13. 13.Half of 36 =
  14. 14.Double 49 =
  15. 15.Half of 48 =
  16. 16.Double 35 =
  17. 17.Half of 52 =
  18. 18.Double 31 =
  19. 19.Double 21 =
  20. 20.Half of 38 =
  21. 21.Half of 160 =
  22. 22.Half of 68 =
  23. 23.Half of 172 =
  24. 24.Half of 50 =
  25. 25.Double 17 =
  26. 26.Half of 144 =
  27. 27.Half of 180 =
  28. 28.Half of 94 =
  29. 29.Half of 30 =
  30. 30.Double 73 =
  31. 31.Half of 40 =
  32. 32.Half of 62 =
  33. 33.Double 92 =
  34. 34.Double 56 =
  35. 35.Half of 74 =
  36. 36.Double 47 =
  37. 37.Half of 58 =
  38. 38.Double 97 =
  39. 39.Half of 130 =
  40. 40.Double 41 =

Answer key

  1. 73
  2. 68
  3. 32
  4. 152
  5. 158
  6. 188
  7. 36
  8. 88
  9. 148
  10. 58
  11. 196
  12. 55
  13. 18
  14. 98
  15. 24
  16. 70
  17. 26
  18. 62
  19. 42
  20. 19
  21. 80
  22. 34
  23. 86
  24. 25
  25. 34
  26. 72
  27. 90
  28. 47
  29. 15
  30. 146
  31. 20
  32. 31
  33. 184
  34. 112
  35. 37
  36. 94
  37. 29
  38. 194
  39. 65
  40. 82

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