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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 303 · 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. 1.79² =
  2. 2.64² =
  3. 3.67² =
  4. 4.51² =
  5. 5.84² =
  6. 6.54² =
  7. 7.57² =
  8. 8.96² =
  9. 9.82² =
  10. 10.68² =
  11. 11.88² =
  12. 12.87² =
  13. 13.86² =
  14. 14.73² =
  15. 15.92² =
  16. 16.91² =
  17. 17.37² =
  18. 18.42² =
  19. 19.56² =
  20. 20.47² =
  21. 21.58² =
  22. 22.85² =
  23. 23.71² =
  24. 24.98² =
  25. 25.39² =
  26. 26.77² =
  27. 27.74² =
  28. 28.49² =
  29. 29.69² =
  30. 30.63² =
  31. 31.41² =
  32. 32.44² =
  33. 33.48² =
  34. 34.75² =
  35. 35.97² =
  36. 36.93² =
  37. 37.33² =
  38. 38.72² =
  39. 39.76² =
  40. 40.36² =

Answer key

  1. 6241
  2. 4096
  3. 4489
  4. 2601
  5. 7056
  6. 2916
  7. 3249
  8. 9216
  9. 6724
  10. 4624
  11. 7744
  12. 7569
  13. 7396
  14. 5329
  15. 8464
  16. 8281
  17. 1369
  18. 1764
  19. 3136
  20. 2209
  21. 3364
  22. 7225
  23. 5041
  24. 9604
  25. 1521
  26. 5929
  27. 5476
  28. 2401
  29. 4761
  30. 3969
  31. 1681
  32. 1936
  33. 2304
  34. 5625
  35. 9409
  36. 8649
  37. 1089
  38. 5184
  39. 5776
  40. 1296

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