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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 315 · 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. 1.47² =
  2. 2.65² =
  3. 3.41² =
  4. 4.87² =
  5. 5.32² =
  6. 6.37² =
  7. 7.64² =
  8. 8.94² =
  9. 9.46² =
  10. 10.92² =
  11. 11.43² =
  12. 12.81² =
  13. 13.54² =
  14. 14.93² =
  15. 15.71² =
  16. 16.89² =
  17. 17.74² =
  18. 18.85² =
  19. 19.72² =
  20. 20.56² =
  21. 21.61² =
  22. 22.69² =
  23. 23.83² =
  24. 24.96² =
  25. 25.75² =
  26. 26.91² =
  27. 27.35² =
  28. 28.51² =
  29. 29.49² =
  30. 30.53² =
  31. 31.99² =
  32. 32.33² =
  33. 33.73² =
  34. 34.79² =
  35. 35.76² =
  36. 36.52² =
  37. 37.84² =
  38. 38.97² =
  39. 39.82² =
  40. 40.58² =

Answer key

  1. 2209
  2. 4225
  3. 1681
  4. 7569
  5. 1024
  6. 1369
  7. 4096
  8. 8836
  9. 2116
  10. 8464
  11. 1849
  12. 6561
  13. 2916
  14. 8649
  15. 5041
  16. 7921
  17. 5476
  18. 7225
  19. 5184
  20. 3136
  21. 3721
  22. 4761
  23. 6889
  24. 9216
  25. 5625
  26. 8281
  27. 1225
  28. 2601
  29. 2401
  30. 2809
  31. 9801
  32. 1089
  33. 5329
  34. 6241
  35. 5776
  36. 2704
  37. 7056
  38. 9409
  39. 6724
  40. 3364

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