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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 671 · 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 21 =
  2. 2.Double 91 =
  3. 3.Half of 132 =
  4. 4.Half of 154 =
  5. 5.Double 22 =
  6. 6.Half of 46 =
  7. 7.Double 86 =
  8. 8.Half of 70 =
  9. 9.Double 37 =
  10. 10.Half of 184 =
  11. 11.Double 16 =
  12. 12.Double 19 =
  13. 13.Half of 68 =
  14. 14.Double 34 =
  15. 15.Half of 44 =
  16. 16.Double 92 =
  17. 17.Half of 50 =
  18. 18.Double 45 =
  19. 19.Half of 126 =
  20. 20.Half of 52 =
  21. 21.Half of 66 =
  22. 22.Double 88 =
  23. 23.Half of 136 =
  24. 24.Double 66 =
  25. 25.Double 67 =
  26. 26.Double 18 =
  27. 27.Half of 128 =
  28. 28.Half of 176 =
  29. 29.Half of 102 =
  30. 30.Half of 118 =
  31. 31.Half of 112 =
  32. 32.Half of 36 =
  33. 33.Double 64 =
  34. 34.Half of 64 =
  35. 35.Half of 56 =
  36. 36.Double 68 =
  37. 37.Double 38 =
  38. 38.Double 41 =
  39. 39.Double 97 =
  40. 40.Half of 58 =

Answer key

  1. 42
  2. 182
  3. 66
  4. 77
  5. 44
  6. 23
  7. 172
  8. 35
  9. 74
  10. 92
  11. 32
  12. 38
  13. 34
  14. 68
  15. 22
  16. 184
  17. 25
  18. 90
  19. 63
  20. 26
  21. 33
  22. 176
  23. 68
  24. 132
  25. 134
  26. 36
  27. 64
  28. 88
  29. 51
  30. 59
  31. 56
  32. 18
  33. 128
  34. 32
  35. 28
  36. 136
  37. 76
  38. 82
  39. 194
  40. 29

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