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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 285 · 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. 1.61² =
  2. 2.88² =
  3. 3.94² =
  4. 4.79² =
  5. 5.39² =
  6. 6.95² =
  7. 7.66² =
  8. 8.42² =
  9. 9.36² =
  10. 10.43² =
  11. 11.54² =
  12. 12.55² =
  13. 13.38² =
  14. 14.41² =
  15. 15.85² =
  16. 16.92² =
  17. 17.71² =
  18. 18.34² =
  19. 19.33² =
  20. 20.35² =
  21. 21.64² =
  22. 22.84² =
  23. 23.72² =
  24. 24.46² =
  25. 25.48² =
  26. 26.86² =
  27. 27.73² =
  28. 28.83² =
  29. 29.67² =
  30. 30.53² =
  31. 31.69² =
  32. 32.49² =
  33. 33.51² =
  34. 34.59² =
  35. 35.32² =
  36. 36.63² =
  37. 37.87² =
  38. 38.68² =
  39. 39.62² =
  40. 40.89² =

Answer key

  1. 3721
  2. 7744
  3. 8836
  4. 6241
  5. 1521
  6. 9025
  7. 4356
  8. 1764
  9. 1296
  10. 1849
  11. 2916
  12. 3025
  13. 1444
  14. 1681
  15. 7225
  16. 8464
  17. 5041
  18. 1156
  19. 1089
  20. 1225
  21. 4096
  22. 7056
  23. 5184
  24. 2116
  25. 2304
  26. 7396
  27. 5329
  28. 6889
  29. 4489
  30. 2809
  31. 4761
  32. 2401
  33. 2601
  34. 3481
  35. 1024
  36. 3969
  37. 7569
  38. 4624
  39. 3844
  40. 7921

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