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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 599 · 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. 1.61² =
  2. 2.94² =
  3. 3.54² =
  4. 4.43² =
  5. 5.33² =
  6. 6.71² =
  7. 7.41² =
  8. 8.91² =
  9. 9.63² =
  10. 10.51² =
  11. 11.31² =
  12. 12.88² =
  13. 13.55² =
  14. 14.97² =
  15. 15.69² =
  16. 16.36² =
  17. 17.99² =
  18. 18.37² =
  19. 19.74² =
  20. 20.81² =
  21. 21.96² =
  22. 22.79² =
  23. 23.49² =
  24. 24.92² =
  25. 25.48² =
  26. 26.34² =
  27. 27.83² =
  28. 28.86² =
  29. 29.66² =
  30. 30.39² =
  31. 31.47² =
  32. 32.85² =
  33. 33.53² =
  34. 34.84² =
  35. 35.77² =
  36. 36.87² =
  37. 37.58² =
  38. 38.57² =
  39. 39.76² =
  40. 40.56² =

Answer key

  1. 3721
  2. 8836
  3. 2916
  4. 1849
  5. 1089
  6. 5041
  7. 1681
  8. 8281
  9. 3969
  10. 2601
  11. 961
  12. 7744
  13. 3025
  14. 9409
  15. 4761
  16. 1296
  17. 9801
  18. 1369
  19. 5476
  20. 6561
  21. 9216
  22. 6241
  23. 2401
  24. 8464
  25. 2304
  26. 1156
  27. 6889
  28. 7396
  29. 4356
  30. 1521
  31. 2209
  32. 7225
  33. 2809
  34. 7056
  35. 5929
  36. 7569
  37. 3364
  38. 3249
  39. 5776
  40. 3136

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