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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 611 · 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. 2.92² =
  3. 3.71² =
  4. 4.75² =
  5. 5.41² =
  6. 6.64² =
  7. 7.58² =
  8. 8.51² =
  9. 9.83² =
  10. 10.98² =
  11. 11.84² =
  12. 12.47² =
  13. 13.77² =
  14. 14.76² =
  15. 15.91² =
  16. 16.43² =
  17. 17.74² =
  18. 18.72² =
  19. 19.35² =
  20. 20.52² =
  21. 21.67² =
  22. 22.68² =
  23. 23.39² =
  24. 24.73² =
  25. 25.88² =
  26. 26.37² =
  27. 27.36² =
  28. 28.32² =
  29. 29.78² =
  30. 30.93² =
  31. 31.82² =
  32. 32.97² =
  33. 33.44² =
  34. 34.55² =
  35. 35.89² =
  36. 36.81² =
  37. 37.86² =
  38. 38.42² =
  39. 39.62² =
  40. 40.48² =

Answer key

  1. 4761
  2. 8464
  3. 5041
  4. 5625
  5. 1681
  6. 4096
  7. 3364
  8. 2601
  9. 6889
  10. 9604
  11. 7056
  12. 2209
  13. 5929
  14. 5776
  15. 8281
  16. 1849
  17. 5476
  18. 5184
  19. 1225
  20. 2704
  21. 4489
  22. 4624
  23. 1521
  24. 5329
  25. 7744
  26. 1369
  27. 1296
  28. 1024
  29. 6084
  30. 8649
  31. 6724
  32. 9409
  33. 1936
  34. 3025
  35. 7921
  36. 6561
  37. 7396
  38. 1764
  39. 3844
  40. 2304

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