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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 32 · 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. 1.33² =
  2. 2.53² =
  3. 3.64² =
  4. 4.37² =
  5. 5.72² =
  6. 6.43² =
  7. 7.89² =
  8. 8.46² =
  9. 9.31² =
  10. 10.84² =
  11. 11.62² =
  12. 12.76² =
  13. 13.83² =
  14. 14.48² =
  15. 15.94² =
  16. 16.49² =
  17. 17.71² =
  18. 18.41² =
  19. 19.99² =
  20. 20.92² =
  21. 21.75² =
  22. 22.56² =
  23. 23.86² =
  24. 24.42² =
  25. 25.59² =
  26. 26.96² =
  27. 27.32² =
  28. 28.67² =
  29. 29.61² =
  30. 30.51² =
  31. 31.74² =
  32. 32.97² =
  33. 33.88² =
  34. 34.58² =
  35. 35.78² =
  36. 36.44² =
  37. 37.69² =
  38. 38.47² =
  39. 39.95² =
  40. 40.91² =

Answer key

  1. 1089
  2. 2809
  3. 4096
  4. 1369
  5. 5184
  6. 1849
  7. 7921
  8. 2116
  9. 961
  10. 7056
  11. 3844
  12. 5776
  13. 6889
  14. 2304
  15. 8836
  16. 2401
  17. 5041
  18. 1681
  19. 9801
  20. 8464
  21. 5625
  22. 3136
  23. 7396
  24. 1764
  25. 3481
  26. 9216
  27. 1024
  28. 4489
  29. 3721
  30. 2601
  31. 5476
  32. 9409
  33. 7744
  34. 3364
  35. 6084
  36. 1936
  37. 4761
  38. 2209
  39. 9025
  40. 8281

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