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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 716 · 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. 1.38² =
  2. 2.71² =
  3. 3.85² =
  4. 4.96² =
  5. 5.34² =
  6. 6.73² =
  7. 7.58² =
  8. 8.84² =
  9. 9.59² =
  10. 10.41² =
  11. 11.42² =
  12. 12.68² =
  13. 13.32² =
  14. 14.91² =
  15. 15.48² =
  16. 16.86² =
  17. 17.81² =
  18. 18.56² =
  19. 19.72² =
  20. 20.65² =
  21. 21.99² =
  22. 22.49² =
  23. 23.55² =
  24. 24.61² =
  25. 25.74² =
  26. 26.94² =
  27. 27.79² =
  28. 28.44² =
  29. 29.57² =
  30. 30.36² =
  31. 31.98² =
  32. 32.92² =
  33. 33.93² =
  34. 34.76² =
  35. 35.47² =
  36. 36.95² =
  37. 37.66² =
  38. 38.45² =
  39. 39.43² =
  40. 40.75² =

Answer key

  1. 1444
  2. 5041
  3. 7225
  4. 9216
  5. 1156
  6. 5329
  7. 3364
  8. 7056
  9. 3481
  10. 1681
  11. 1764
  12. 4624
  13. 1024
  14. 8281
  15. 2304
  16. 7396
  17. 6561
  18. 3136
  19. 5184
  20. 4225
  21. 9801
  22. 2401
  23. 3025
  24. 3721
  25. 5476
  26. 8836
  27. 6241
  28. 1936
  29. 3249
  30. 1296
  31. 9604
  32. 8464
  33. 8649
  34. 5776
  35. 2209
  36. 9025
  37. 4356
  38. 2025
  39. 1849
  40. 5625

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