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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 124 · 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. 1.71² =
  2. 2.56² =
  3. 3.87² =
  4. 4.98² =
  5. 5.35² =
  6. 6.92² =
  7. 7.74² =
  8. 8.94² =
  9. 9.73² =
  10. 10.84² =
  11. 11.41² =
  12. 12.47² =
  13. 13.36² =
  14. 14.33² =
  15. 15.63² =
  16. 16.89² =
  17. 17.81² =
  18. 18.44² =
  19. 19.32² =
  20. 20.53² =
  21. 21.49² =
  22. 22.83² =
  23. 23.93² =
  24. 24.48² =
  25. 25.34² =
  26. 26.55² =
  27. 27.42² =
  28. 28.88² =
  29. 29.46² =
  30. 30.61² =
  31. 31.45² =
  32. 32.86² =
  33. 33.69² =
  34. 34.38² =
  35. 35.37² =
  36. 36.91² =
  37. 37.43² =
  38. 38.66² =
  39. 39.67² =
  40. 40.76² =

Answer key

  1. 5041
  2. 3136
  3. 7569
  4. 9604
  5. 1225
  6. 8464
  7. 5476
  8. 8836
  9. 5329
  10. 7056
  11. 1681
  12. 2209
  13. 1296
  14. 1089
  15. 3969
  16. 7921
  17. 6561
  18. 1936
  19. 1024
  20. 2809
  21. 2401
  22. 6889
  23. 8649
  24. 2304
  25. 1156
  26. 3025
  27. 1764
  28. 7744
  29. 2116
  30. 3721
  31. 2025
  32. 7396
  33. 4761
  34. 1444
  35. 1369
  36. 8281
  37. 1849
  38. 4356
  39. 4489
  40. 5776

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