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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 238 · 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. 1.86² =
  2. 2.81² =
  3. 3.72² =
  4. 4.36² =
  5. 5.95² =
  6. 6.44² =
  7. 7.46² =
  8. 8.58² =
  9. 9.41² =
  10. 10.82² =
  11. 11.31² =
  12. 12.55² =
  13. 13.52² =
  14. 14.38² =
  15. 15.61² =
  16. 16.54² =
  17. 17.43² =
  18. 18.42² =
  19. 19.67² =
  20. 20.97² =
  21. 21.39² =
  22. 22.66² =
  23. 23.49² =
  24. 24.51² =
  25. 25.34² =
  26. 26.92² =
  27. 27.47² =
  28. 28.65² =
  29. 29.74² =
  30. 30.62² =
  31. 31.79² =
  32. 32.59² =
  33. 33.35² =
  34. 34.85² =
  35. 35.56² =
  36. 36.71² =
  37. 37.94² =
  38. 38.32² =
  39. 39.53² =
  40. 40.89² =

Answer key

  1. 7396
  2. 6561
  3. 5184
  4. 1296
  5. 9025
  6. 1936
  7. 2116
  8. 3364
  9. 1681
  10. 6724
  11. 961
  12. 3025
  13. 2704
  14. 1444
  15. 3721
  16. 2916
  17. 1849
  18. 1764
  19. 4489
  20. 9409
  21. 1521
  22. 4356
  23. 2401
  24. 2601
  25. 1156
  26. 8464
  27. 2209
  28. 4225
  29. 5476
  30. 3844
  31. 6241
  32. 3481
  33. 1225
  34. 7225
  35. 3136
  36. 5041
  37. 8836
  38. 1024
  39. 2809
  40. 7921

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