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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 728 · 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. 1.83² =
  2. 2.41² =
  3. 3.33² =
  4. 4.97² =
  5. 5.71² =
  6. 6.91² =
  7. 7.61² =
  8. 8.87² =
  9. 9.64² =
  10. 10.95² =
  11. 11.48² =
  12. 12.31² =
  13. 13.93² =
  14. 14.89² =
  15. 15.62² =
  16. 16.86² =
  17. 17.63² =
  18. 18.56² =
  19. 19.98² =
  20. 20.55² =
  21. 21.45² =
  22. 22.66² =
  23. 23.53² =
  24. 24.84² =
  25. 25.88² =
  26. 26.34² =
  27. 27.59² =
  28. 28.42² =
  29. 29.74² =
  30. 30.85² =
  31. 31.35² =
  32. 32.76² =
  33. 33.67² =
  34. 34.32² =
  35. 35.38² =
  36. 36.81² =
  37. 37.72² =
  38. 38.58² =
  39. 39.92² =
  40. 40.46² =

Answer key

  1. 6889
  2. 1681
  3. 1089
  4. 9409
  5. 5041
  6. 8281
  7. 3721
  8. 7569
  9. 4096
  10. 9025
  11. 2304
  12. 961
  13. 8649
  14. 7921
  15. 3844
  16. 7396
  17. 3969
  18. 3136
  19. 9604
  20. 3025
  21. 2025
  22. 4356
  23. 2809
  24. 7056
  25. 7744
  26. 1156
  27. 3481
  28. 1764
  29. 5476
  30. 7225
  31. 1225
  32. 5776
  33. 4489
  34. 1024
  35. 1444
  36. 6561
  37. 5184
  38. 3364
  39. 8464
  40. 2116

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