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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 93 · 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. 1.46² =
  2. 2.93² =
  3. 3.67² =
  4. 4.51² =
  5. 5.34² =
  6. 6.44² =
  7. 7.69² =
  8. 8.95² =
  9. 9.54² =
  10. 10.71² =
  11. 11.84² =
  12. 12.39² =
  13. 13.53² =
  14. 14.33² =
  15. 15.59² =
  16. 16.68² =
  17. 17.89² =
  18. 18.49² =
  19. 19.36² =
  20. 20.41² =
  21. 21.57² =
  22. 22.72² =
  23. 23.38² =
  24. 24.82² =
  25. 25.61² =
  26. 26.58² =
  27. 27.32² =
  28. 28.74² =
  29. 29.31² =
  30. 30.88² =
  31. 31.47² =
  32. 32.35² =
  33. 33.75² =
  34. 34.81² =
  35. 35.92² =
  36. 36.91² =
  37. 37.37² =
  38. 38.96² =
  39. 39.87² =
  40. 40.63² =

Answer key

  1. 2116
  2. 8649
  3. 4489
  4. 2601
  5. 1156
  6. 1936
  7. 4761
  8. 9025
  9. 2916
  10. 5041
  11. 7056
  12. 1521
  13. 2809
  14. 1089
  15. 3481
  16. 4624
  17. 7921
  18. 2401
  19. 1296
  20. 1681
  21. 3249
  22. 5184
  23. 1444
  24. 6724
  25. 3721
  26. 3364
  27. 1024
  28. 5476
  29. 961
  30. 7744
  31. 2209
  32. 1225
  33. 5625
  34. 6561
  35. 8464
  36. 8281
  37. 1369
  38. 9216
  39. 7569
  40. 3969

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