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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 647 · 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 102 =
  2. 2.Double 97 =
  3. 3.Double 44 =
  4. 4.Half of 42 =
  5. 5.Double 64 =
  6. 6.Double 24 =
  7. 7.Half of 130 =
  8. 8.Double 49 =
  9. 9.Double 89 =
  10. 10.Double 46 =
  11. 11.Double 37 =
  12. 12.Half of 110 =
  13. 13.Double 88 =
  14. 14.Double 91 =
  15. 15.Double 79 =
  16. 16.Half of 28 =
  17. 17.Double 76 =
  18. 18.Half of 70 =
  19. 19.Double 69 =
  20. 20.Half of 58 =
  21. 21.Half of 144 =
  22. 22.Half of 34 =
  23. 23.Double 87 =
  24. 24.Half of 88 =
  25. 25.Double 78 =
  26. 26.Half of 124 =
  27. 27.Double 73 =
  28. 28.Half of 50 =
  29. 29.Half of 126 =
  30. 30.Double 19 =
  31. 31.Double 36 =
  32. 32.Double 96 =
  33. 33.Half of 178 =
  34. 34.Double 52 =
  35. 35.Double 95 =
  36. 36.Double 27 =
  37. 37.Double 85 =
  38. 38.Half of 54 =
  39. 39.Double 21 =
  40. 40.Half of 80 =

Answer key

  1. 51
  2. 194
  3. 88
  4. 21
  5. 128
  6. 48
  7. 65
  8. 98
  9. 178
  10. 92
  11. 74
  12. 55
  13. 176
  14. 182
  15. 158
  16. 14
  17. 152
  18. 35
  19. 138
  20. 29
  21. 72
  22. 17
  23. 174
  24. 44
  25. 156
  26. 62
  27. 146
  28. 25
  29. 63
  30. 38
  31. 72
  32. 192
  33. 89
  34. 104
  35. 190
  36. 54
  37. 170
  38. 27
  39. 42
  40. 40

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