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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 135 · 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. 1.65² =
  2. 2.78² =
  3. 3.49² =
  4. 4.59² =
  5. 5.32² =
  6. 6.88² =
  7. 7.48² =
  8. 8.47² =
  9. 9.71² =
  10. 10.79² =
  11. 11.46² =
  12. 12.91² =
  13. 13.31² =
  14. 14.95² =
  15. 15.83² =
  16. 16.69² =
  17. 17.34² =
  18. 18.42² =
  19. 19.35² =
  20. 20.82² =
  21. 21.33² =
  22. 22.37² =
  23. 23.67² =
  24. 24.36² =
  25. 25.41² =
  26. 26.38² =
  27. 27.93² =
  28. 28.77² =
  29. 29.76² =
  30. 30.94² =
  31. 31.75² =
  32. 32.62² =
  33. 33.98² =
  34. 34.72² =
  35. 35.57² =
  36. 36.39² =
  37. 37.96² =
  38. 38.92² =
  39. 39.51² =
  40. 40.55² =

Answer key

  1. 4225
  2. 6084
  3. 2401
  4. 3481
  5. 1024
  6. 7744
  7. 2304
  8. 2209
  9. 5041
  10. 6241
  11. 2116
  12. 8281
  13. 961
  14. 9025
  15. 6889
  16. 4761
  17. 1156
  18. 1764
  19. 1225
  20. 6724
  21. 1089
  22. 1369
  23. 4489
  24. 1296
  25. 1681
  26. 1444
  27. 8649
  28. 5929
  29. 5776
  30. 8836
  31. 5625
  32. 3844
  33. 9604
  34. 5184
  35. 3249
  36. 1521
  37. 9216
  38. 8464
  39. 2601
  40. 3025

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