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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 50 · 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. 1.69² =
  2. 2.83² =
  3. 3.34² =
  4. 4.76² =
  5. 5.57² =
  6. 6.88² =
  7. 7.43² =
  8. 8.77² =
  9. 9.49² =
  10. 10.35² =
  11. 11.92² =
  12. 12.63² =
  13. 13.47² =
  14. 14.73² =
  15. 15.31² =
  16. 16.36² =
  17. 17.84² =
  18. 18.85² =
  19. 19.38² =
  20. 20.62² =
  21. 21.97² =
  22. 22.48² =
  23. 23.37² =
  24. 24.52² =
  25. 25.87² =
  26. 26.71² =
  27. 27.58² =
  28. 28.95² =
  29. 29.46² =
  30. 30.39² =
  31. 31.67² =
  32. 32.41² =
  33. 33.86² =
  34. 34.72² =
  35. 35.98² =
  36. 36.96² =
  37. 37.74² =
  38. 38.91² =
  39. 39.33² =
  40. 40.51² =

Answer key

  1. 4761
  2. 6889
  3. 1156
  4. 5776
  5. 3249
  6. 7744
  7. 1849
  8. 5929
  9. 2401
  10. 1225
  11. 8464
  12. 3969
  13. 2209
  14. 5329
  15. 961
  16. 1296
  17. 7056
  18. 7225
  19. 1444
  20. 3844
  21. 9409
  22. 2304
  23. 1369
  24. 2704
  25. 7569
  26. 5041
  27. 3364
  28. 9025
  29. 2116
  30. 1521
  31. 4489
  32. 1681
  33. 7396
  34. 5184
  35. 9604
  36. 9216
  37. 5476
  38. 8281
  39. 1089
  40. 2601

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