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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 790 · 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 97 =
  2. 2.Half of 58 =
  3. 3.Half of 40 =
  4. 4.Half of 66 =
  5. 5.Double 36 =
  6. 6.Double 24 =
  7. 7.Half of 112 =
  8. 8.Double 75 =
  9. 9.Double 65 =
  10. 10.Half of 48 =
  11. 11.Half of 100 =
  12. 12.Double 76 =
  13. 13.Double 85 =
  14. 14.Half of 68 =
  15. 15.Double 45 =
  16. 16.Double 28 =
  17. 17.Half of 152 =
  18. 18.Half of 80 =
  19. 19.Double 21 =
  20. 20.Double 74 =
  21. 21.Double 73 =
  22. 22.Double 62 =
  23. 23.Half of 198 =
  24. 24.Double 59 =
  25. 25.Half of 168 =
  26. 26.Half of 188 =
  27. 27.Half of 56 =
  28. 28.Half of 124 =
  29. 29.Double 25 =
  30. 30.Double 78 =
  31. 31.Double 34 =
  32. 32.Double 16 =
  33. 33.Double 35 =
  34. 34.Double 96 =
  35. 35.Double 41 =
  36. 36.Half of 94 =
  37. 37.Double 84 =
  38. 38.Half of 140 =
  39. 39.Half of 64 =
  40. 40.Half of 96 =

Answer key

  1. 194
  2. 29
  3. 20
  4. 33
  5. 72
  6. 48
  7. 56
  8. 150
  9. 130
  10. 24
  11. 50
  12. 152
  13. 170
  14. 34
  15. 90
  16. 56
  17. 76
  18. 40
  19. 42
  20. 148
  21. 146
  22. 124
  23. 99
  24. 118
  25. 84
  26. 94
  27. 28
  28. 62
  29. 50
  30. 156
  31. 68
  32. 32
  33. 70
  34. 192
  35. 82
  36. 47
  37. 168
  38. 70
  39. 32
  40. 48

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