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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 188 · 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. 1.46² =
  2. 2.69² =
  3. 3.34² =
  4. 4.47² =
  5. 5.51² =
  6. 6.86² =
  7. 7.67² =
  8. 8.97² =
  9. 9.32² =
  10. 10.91² =
  11. 11.76² =
  12. 12.55² =
  13. 13.75² =
  14. 14.61² =
  15. 15.53² =
  16. 16.44² =
  17. 17.31² =
  18. 18.87² =
  19. 19.84² =
  20. 20.45² =
  21. 21.72² =
  22. 22.62² =
  23. 23.64² =
  24. 24.85² =
  25. 25.83² =
  26. 26.94² =
  27. 27.57² =
  28. 28.58² =
  29. 29.71² =
  30. 30.68² =
  31. 31.41² =
  32. 32.39² =
  33. 33.54² =
  34. 34.66² =
  35. 35.33² =
  36. 36.43² =
  37. 37.42² =
  38. 38.35² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 2116
  2. 4761
  3. 1156
  4. 2209
  5. 2601
  6. 7396
  7. 4489
  8. 9409
  9. 1024
  10. 8281
  11. 5776
  12. 3025
  13. 5625
  14. 3721
  15. 2809
  16. 1936
  17. 961
  18. 7569
  19. 7056
  20. 2025
  21. 5184
  22. 3844
  23. 4096
  24. 7225
  25. 6889
  26. 8836
  27. 3249
  28. 3364
  29. 5041
  30. 4624
  31. 1681
  32. 1521
  33. 2916
  34. 4356
  35. 1089
  36. 1849
  37. 1764
  38. 1225
  39. 6241
  40. 6561

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