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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 781 · 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. 1.68² =
  2. 2.75² =
  3. 3.76² =
  4. 4.61² =
  5. 5.65² =
  6. 6.56² =
  7. 7.72² =
  8. 8.48² =
  9. 9.78² =
  10. 10.46² =
  11. 11.32² =
  12. 12.94² =
  13. 13.43² =
  14. 14.96² =
  15. 15.83² =
  16. 16.31² =
  17. 17.86² =
  18. 18.54² =
  19. 19.73² =
  20. 20.37² =
  21. 21.44² =
  22. 22.34² =
  23. 23.47² =
  24. 24.84² =
  25. 25.42² =
  26. 26.69² =
  27. 27.95² =
  28. 28.82² =
  29. 29.88² =
  30. 30.87² =
  31. 31.33² =
  32. 32.77² =
  33. 33.53² =
  34. 34.97² =
  35. 35.52² =
  36. 36.79² =
  37. 37.85² =
  38. 38.41² =
  39. 39.81² =
  40. 40.71² =

Answer key

  1. 4624
  2. 5625
  3. 5776
  4. 3721
  5. 4225
  6. 3136
  7. 5184
  8. 2304
  9. 6084
  10. 2116
  11. 1024
  12. 8836
  13. 1849
  14. 9216
  15. 6889
  16. 961
  17. 7396
  18. 2916
  19. 5329
  20. 1369
  21. 1936
  22. 1156
  23. 2209
  24. 7056
  25. 1764
  26. 4761
  27. 9025
  28. 6724
  29. 7744
  30. 7569
  31. 1089
  32. 5929
  33. 2809
  34. 9409
  35. 2704
  36. 6241
  37. 7225
  38. 1681
  39. 6561
  40. 5041

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