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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 33 · 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. 1.91² =
  2. 2.44² =
  3. 3.53² =
  4. 4.66² =
  5. 5.97² =
  6. 6.39² =
  7. 7.34² =
  8. 8.87² =
  9. 9.48² =
  10. 10.62² =
  11. 11.83² =
  12. 12.71² =
  13. 13.38² =
  14. 14.57² =
  15. 15.94² =
  16. 16.58² =
  17. 17.84² =
  18. 18.47² =
  19. 19.88² =
  20. 20.61² =
  21. 21.41² =
  22. 22.85² =
  23. 23.69² =
  24. 24.55² =
  25. 25.92² =
  26. 26.42² =
  27. 27.81² =
  28. 28.54² =
  29. 29.59² =
  30. 30.37² =
  31. 31.64² =
  32. 32.43² =
  33. 33.45² =
  34. 34.46² =
  35. 35.35² =
  36. 36.82² =
  37. 37.68² =
  38. 38.93² =
  39. 39.49² =
  40. 40.72² =

Answer key

  1. 8281
  2. 1936
  3. 2809
  4. 4356
  5. 9409
  6. 1521
  7. 1156
  8. 7569
  9. 2304
  10. 3844
  11. 6889
  12. 5041
  13. 1444
  14. 3249
  15. 8836
  16. 3364
  17. 7056
  18. 2209
  19. 7744
  20. 3721
  21. 1681
  22. 7225
  23. 4761
  24. 3025
  25. 8464
  26. 1764
  27. 6561
  28. 2916
  29. 3481
  30. 1369
  31. 4096
  32. 1849
  33. 2025
  34. 2116
  35. 1225
  36. 6724
  37. 4624
  38. 8649
  39. 2401
  40. 5184

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