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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 882 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.41² =
  2. 2.31² =
  3. 3.68² =
  4. 4.63² =
  5. 5.55² =
  6. 6.73² =
  7. 7.86² =
  8. 8.51² =
  9. 9.61² =
  10. 10.72² =
  11. 11.67² =
  12. 12.34² =
  13. 13.49² =
  14. 14.97² =
  15. 15.39² =
  16. 16.96² =
  17. 17.38² =
  18. 18.37² =
  19. 19.53² =
  20. 20.32² =
  21. 21.46² =
  22. 22.91² =
  23. 23.52² =
  24. 24.66² =
  25. 25.47² =
  26. 26.35² =
  27. 27.54² =
  28. 28.62² =
  29. 29.81² =
  30. 30.45² =
  31. 31.92² =
  32. 32.48² =
  33. 33.42² =
  34. 34.94² =
  35. 35.33² =
  36. 36.36² =
  37. 37.79² =
  38. 38.69² =
  39. 39.44² =
  40. 40.64² =

Answer key

  1. 1681
  2. 961
  3. 4624
  4. 3969
  5. 3025
  6. 5329
  7. 7396
  8. 2601
  9. 3721
  10. 5184
  11. 4489
  12. 1156
  13. 2401
  14. 9409
  15. 1521
  16. 9216
  17. 1444
  18. 1369
  19. 2809
  20. 1024
  21. 2116
  22. 8281
  23. 2704
  24. 4356
  25. 2209
  26. 1225
  27. 2916
  28. 3844
  29. 6561
  30. 2025
  31. 8464
  32. 2304
  33. 1764
  34. 8836
  35. 1089
  36. 1296
  37. 6241
  38. 4761
  39. 1936
  40. 4096

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