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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 598 · 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. 2.35² =
  3. 3.58² =
  4. 4.51² =
  5. 5.36² =
  6. 6.69² =
  7. 7.74² =
  8. 8.72² =
  9. 9.48² =
  10. 10.34² =
  11. 11.66² =
  12. 12.52² =
  13. 13.33² =
  14. 14.92² =
  15. 15.37² =
  16. 16.63² =
  17. 17.61² =
  18. 18.43² =
  19. 19.73² =
  20. 20.42² =
  21. 21.88² =
  22. 22.56² =
  23. 23.76² =
  24. 24.98² =
  25. 25.91² =
  26. 26.81² =
  27. 27.79² =
  28. 28.38² =
  29. 29.41² =
  30. 30.67² =
  31. 31.46² =
  32. 32.59² =
  33. 33.96² =
  34. 34.55² =
  35. 35.78² =
  36. 36.77² =
  37. 37.49² =
  38. 38.83² =
  39. 39.53² =
  40. 40.86² =

Answer key

  1. 3844
  2. 1225
  3. 3364
  4. 2601
  5. 1296
  6. 4761
  7. 5476
  8. 5184
  9. 2304
  10. 1156
  11. 4356
  12. 2704
  13. 1089
  14. 8464
  15. 1369
  16. 3969
  17. 3721
  18. 1849
  19. 5329
  20. 1764
  21. 7744
  22. 3136
  23. 5776
  24. 9604
  25. 8281
  26. 6561
  27. 6241
  28. 1444
  29. 1681
  30. 4489
  31. 2116
  32. 3481
  33. 9216
  34. 3025
  35. 6084
  36. 5929
  37. 2401
  38. 6889
  39. 2809
  40. 7396

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