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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 465 · 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. 1.56² =
  2. 2.51² =
  3. 3.86² =
  4. 4.58² =
  5. 5.71² =
  6. 6.33² =
  7. 7.37² =
  8. 8.73² =
  9. 9.94² =
  10. 10.38² =
  11. 11.42² =
  12. 12.74² =
  13. 13.83² =
  14. 14.34² =
  15. 15.99² =
  16. 16.59² =
  17. 17.88² =
  18. 18.95² =
  19. 19.77² =
  20. 20.57² =
  21. 21.53² =
  22. 22.47² =
  23. 23.85² =
  24. 24.96² =
  25. 25.63² =
  26. 26.61² =
  27. 27.48² =
  28. 28.87² =
  29. 29.81² =
  30. 30.91² =
  31. 31.69² =
  32. 32.62² =
  33. 33.41² =
  34. 34.43² =
  35. 35.98² =
  36. 36.84² =
  37. 37.76² =
  38. 38.82² =
  39. 39.75² =
  40. 40.46² =

Answer key

  1. 3136
  2. 2601
  3. 7396
  4. 3364
  5. 5041
  6. 1089
  7. 1369
  8. 5329
  9. 8836
  10. 1444
  11. 1764
  12. 5476
  13. 6889
  14. 1156
  15. 9801
  16. 3481
  17. 7744
  18. 9025
  19. 5929
  20. 3249
  21. 2809
  22. 2209
  23. 7225
  24. 9216
  25. 3969
  26. 3721
  27. 2304
  28. 7569
  29. 6561
  30. 8281
  31. 4761
  32. 3844
  33. 1681
  34. 1849
  35. 9604
  36. 7056
  37. 5776
  38. 6724
  39. 5625
  40. 2116

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