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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 219 · 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. 1.39² =
  2. 2.61² =
  3. 3.38² =
  4. 4.99² =
  5. 5.92² =
  6. 6.31² =
  7. 7.66² =
  8. 8.91² =
  9. 9.94² =
  10. 10.88² =
  11. 11.56² =
  12. 12.33² =
  13. 13.63² =
  14. 14.95² =
  15. 15.43² =
  16. 16.93² =
  17. 17.36² =
  18. 18.86² =
  19. 19.77² =
  20. 20.59² =
  21. 21.37² =
  22. 22.47² =
  23. 23.67² =
  24. 24.76² =
  25. 25.83² =
  26. 26.81² =
  27. 27.71² =
  28. 28.75² =
  29. 29.55² =
  30. 30.45² =
  31. 31.49² =
  32. 32.79² =
  33. 33.98² =
  34. 34.82² =
  35. 35.51² =
  36. 36.96² =
  37. 37.72² =
  38. 38.46² =
  39. 39.34² =
  40. 40.57² =

Answer key

  1. 1521
  2. 3721
  3. 1444
  4. 9801
  5. 8464
  6. 961
  7. 4356
  8. 8281
  9. 8836
  10. 7744
  11. 3136
  12. 1089
  13. 3969
  14. 9025
  15. 1849
  16. 8649
  17. 1296
  18. 7396
  19. 5929
  20. 3481
  21. 1369
  22. 2209
  23. 4489
  24. 5776
  25. 6889
  26. 6561
  27. 5041
  28. 5625
  29. 3025
  30. 2025
  31. 2401
  32. 6241
  33. 9604
  34. 6724
  35. 2601
  36. 9216
  37. 5184
  38. 2116
  39. 1156
  40. 3249

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