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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 709 · 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. 1.42² =
  2. 2.95² =
  3. 3.61² =
  4. 4.43² =
  5. 5.35² =
  6. 6.98² =
  7. 7.41² =
  8. 8.83² =
  9. 9.54² =
  10. 10.75² =
  11. 11.57² =
  12. 12.86² =
  13. 13.55² =
  14. 14.38² =
  15. 15.97² =
  16. 16.94² =
  17. 17.96² =
  18. 18.71² =
  19. 19.99² =
  20. 20.74² =
  21. 21.69² =
  22. 22.89² =
  23. 23.91² =
  24. 24.36² =
  25. 25.73² =
  26. 26.78² =
  27. 27.84² =
  28. 28.49² =
  29. 29.53² =
  30. 30.47² =
  31. 31.34² =
  32. 32.32² =
  33. 33.48² =
  34. 34.56² =
  35. 35.44² =
  36. 36.87² =
  37. 37.46² =
  38. 38.58² =
  39. 39.51² =
  40. 40.37² =

Answer key

  1. 1764
  2. 9025
  3. 3721
  4. 1849
  5. 1225
  6. 9604
  7. 1681
  8. 6889
  9. 2916
  10. 5625
  11. 3249
  12. 7396
  13. 3025
  14. 1444
  15. 9409
  16. 8836
  17. 9216
  18. 5041
  19. 9801
  20. 5476
  21. 4761
  22. 7921
  23. 8281
  24. 1296
  25. 5329
  26. 6084
  27. 7056
  28. 2401
  29. 2809
  30. 2209
  31. 1156
  32. 1024
  33. 2304
  34. 3136
  35. 1936
  36. 7569
  37. 2116
  38. 3364
  39. 2601
  40. 1369

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