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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 773 · 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. 1.62² =
  2. 2.34² =
  3. 3.64² =
  4. 4.39² =
  5. 5.59² =
  6. 6.81² =
  7. 7.68² =
  8. 8.48² =
  9. 9.71² =
  10. 10.37² =
  11. 11.66² =
  12. 12.91² =
  13. 13.42² =
  14. 14.99² =
  15. 15.69² =
  16. 16.36² =
  17. 17.49² =
  18. 18.93² =
  19. 19.79² =
  20. 20.89² =
  21. 21.98² =
  22. 22.67² =
  23. 23.74² =
  24. 24.73² =
  25. 25.41² =
  26. 26.76² =
  27. 27.57² =
  28. 28.53² =
  29. 29.47² =
  30. 30.61² =
  31. 31.38² =
  32. 32.96² =
  33. 33.33² =
  34. 34.84² =
  35. 35.45² =
  36. 36.83² =
  37. 37.77² =
  38. 38.58² =
  39. 39.43² =
  40. 40.92² =

Answer key

  1. 3844
  2. 1156
  3. 4096
  4. 1521
  5. 3481
  6. 6561
  7. 4624
  8. 2304
  9. 5041
  10. 1369
  11. 4356
  12. 8281
  13. 1764
  14. 9801
  15. 4761
  16. 1296
  17. 2401
  18. 8649
  19. 6241
  20. 7921
  21. 9604
  22. 4489
  23. 5476
  24. 5329
  25. 1681
  26. 5776
  27. 3249
  28. 2809
  29. 2209
  30. 3721
  31. 1444
  32. 9216
  33. 1089
  34. 7056
  35. 2025
  36. 6889
  37. 5929
  38. 3364
  39. 1849
  40. 8464

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