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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 684 · 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. 1.32² =
  2. 2.53² =
  3. 3.66² =
  4. 4.81² =
  5. 5.72² =
  6. 6.37² =
  7. 7.74² =
  8. 8.41² =
  9. 9.35² =
  10. 10.75² =
  11. 11.42² =
  12. 12.33² =
  13. 13.38² =
  14. 14.91² =
  15. 15.92² =
  16. 16.84² =
  17. 17.94² =
  18. 18.55² =
  19. 19.54² =
  20. 20.73² =
  21. 21.85² =
  22. 22.96² =
  23. 23.44² =
  24. 24.97² =
  25. 25.56² =
  26. 26.95² =
  27. 27.65² =
  28. 28.61² =
  29. 29.43² =
  30. 30.82² =
  31. 31.49² =
  32. 32.48² =
  33. 33.78² =
  34. 34.89² =
  35. 35.71² =
  36. 36.46² =
  37. 37.87² =
  38. 38.68² =
  39. 39.64² =
  40. 40.86² =

Answer key

  1. 1024
  2. 2809
  3. 4356
  4. 6561
  5. 5184
  6. 1369
  7. 5476
  8. 1681
  9. 1225
  10. 5625
  11. 1764
  12. 1089
  13. 1444
  14. 8281
  15. 8464
  16. 7056
  17. 8836
  18. 3025
  19. 2916
  20. 5329
  21. 7225
  22. 9216
  23. 1936
  24. 9409
  25. 3136
  26. 9025
  27. 4225
  28. 3721
  29. 1849
  30. 6724
  31. 2401
  32. 2304
  33. 6084
  34. 7921
  35. 5041
  36. 2116
  37. 7569
  38. 4624
  39. 4096
  40. 7396

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