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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 702 · 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. 1.35² =
  2. 2.51² =
  3. 3.92² =
  4. 4.76² =
  5. 5.81² =
  6. 6.33² =
  7. 7.49² =
  8. 8.47² =
  9. 9.31² =
  10. 10.56² =
  11. 11.43² =
  12. 12.61² =
  13. 13.83² =
  14. 14.71² =
  15. 15.82² =
  16. 16.68² =
  17. 17.36² =
  18. 18.46² =
  19. 19.38² =
  20. 20.37² =
  21. 21.87² =
  22. 22.78² =
  23. 23.75² =
  24. 24.34² =
  25. 25.41² =
  26. 26.84² =
  27. 27.69² =
  28. 28.77² =
  29. 29.55² =
  30. 30.89² =
  31. 31.64² =
  32. 32.85² =
  33. 33.42² =
  34. 34.94² =
  35. 35.57² =
  36. 36.54² =
  37. 37.48² =
  38. 38.79² =
  39. 39.65² =
  40. 40.44² =

Answer key

  1. 1225
  2. 2601
  3. 8464
  4. 5776
  5. 6561
  6. 1089
  7. 2401
  8. 2209
  9. 961
  10. 3136
  11. 1849
  12. 3721
  13. 6889
  14. 5041
  15. 6724
  16. 4624
  17. 1296
  18. 2116
  19. 1444
  20. 1369
  21. 7569
  22. 6084
  23. 5625
  24. 1156
  25. 1681
  26. 7056
  27. 4761
  28. 5929
  29. 3025
  30. 7921
  31. 4096
  32. 7225
  33. 1764
  34. 8836
  35. 3249
  36. 2916
  37. 2304
  38. 6241
  39. 4225
  40. 1936

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