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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 143 · 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. 1.68² =
  2. 2.48² =
  3. 3.63² =
  4. 4.51² =
  5. 5.91² =
  6. 6.67² =
  7. 7.58² =
  8. 8.86² =
  9. 9.46² =
  10. 10.55² =
  11. 11.82² =
  12. 12.47² =
  13. 13.73² =
  14. 14.98² =
  15. 15.44² =
  16. 16.94² =
  17. 17.36² =
  18. 18.32² =
  19. 19.97² =
  20. 20.81² =
  21. 21.69² =
  22. 22.59² =
  23. 23.74² =
  24. 24.78² =
  25. 25.93² =
  26. 26.37² =
  27. 27.53² =
  28. 28.56² =
  29. 29.41² =
  30. 30.66² =
  31. 31.92² =
  32. 32.72² =
  33. 33.62² =
  34. 34.77² =
  35. 35.38² =
  36. 36.75² =
  37. 37.87² =
  38. 38.83² =
  39. 39.95² =
  40. 40.31² =

Answer key

  1. 4624
  2. 2304
  3. 3969
  4. 2601
  5. 8281
  6. 4489
  7. 3364
  8. 7396
  9. 2116
  10. 3025
  11. 6724
  12. 2209
  13. 5329
  14. 9604
  15. 1936
  16. 8836
  17. 1296
  18. 1024
  19. 9409
  20. 6561
  21. 4761
  22. 3481
  23. 5476
  24. 6084
  25. 8649
  26. 1369
  27. 2809
  28. 3136
  29. 1681
  30. 4356
  31. 8464
  32. 5184
  33. 3844
  34. 5929
  35. 1444
  36. 5625
  37. 7569
  38. 6889
  39. 9025
  40. 961

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