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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 542 · 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. 1.57² =
  2. 2.49² =
  3. 3.61² =
  4. 4.51² =
  5. 5.41² =
  6. 6.37² =
  7. 7.48² =
  8. 8.34² =
  9. 9.33² =
  10. 10.46² =
  11. 11.71² =
  12. 12.88² =
  13. 13.83² =
  14. 14.64² =
  15. 15.38² =
  16. 16.66² =
  17. 17.52² =
  18. 18.86² =
  19. 19.94² =
  20. 20.81² =
  21. 21.44² =
  22. 22.36² =
  23. 23.32² =
  24. 24.47² =
  25. 25.59² =
  26. 26.75² =
  27. 27.45² =
  28. 28.87² =
  29. 29.69² =
  30. 30.43² =
  31. 31.55² =
  32. 32.98² =
  33. 33.35² =
  34. 34.31² =
  35. 35.58² =
  36. 36.63² =
  37. 37.79² =
  38. 38.77² =
  39. 39.89² =
  40. 40.42² =

Answer key

  1. 3249
  2. 2401
  3. 3721
  4. 2601
  5. 1681
  6. 1369
  7. 2304
  8. 1156
  9. 1089
  10. 2116
  11. 5041
  12. 7744
  13. 6889
  14. 4096
  15. 1444
  16. 4356
  17. 2704
  18. 7396
  19. 8836
  20. 6561
  21. 1936
  22. 1296
  23. 1024
  24. 2209
  25. 3481
  26. 5625
  27. 2025
  28. 7569
  29. 4761
  30. 1849
  31. 3025
  32. 9604
  33. 1225
  34. 961
  35. 3364
  36. 3969
  37. 6241
  38. 5929
  39. 7921
  40. 1764

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