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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 448 · 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. 1.75² =
  2. 2.93² =
  3. 3.45² =
  4. 4.36² =
  5. 5.47² =
  6. 6.31² =
  7. 7.51² =
  8. 8.86² =
  9. 9.39² =
  10. 10.46² =
  11. 11.61² =
  12. 12.91² =
  13. 13.41² =
  14. 14.98² =
  15. 15.62² =
  16. 16.35² =
  17. 17.66² =
  18. 18.97² =
  19. 19.89² =
  20. 20.44² =
  21. 21.33² =
  22. 22.58² =
  23. 23.79² =
  24. 24.78² =
  25. 25.87² =
  26. 26.81² =
  27. 27.53² =
  28. 28.43² =
  29. 29.55² =
  30. 30.34² =
  31. 31.71² =
  32. 32.42² =
  33. 33.52² =
  34. 34.54² =
  35. 35.67² =
  36. 36.96² =
  37. 37.76² =
  38. 38.95² =
  39. 39.69² =
  40. 40.56² =

Answer key

  1. 5625
  2. 8649
  3. 2025
  4. 1296
  5. 2209
  6. 961
  7. 2601
  8. 7396
  9. 1521
  10. 2116
  11. 3721
  12. 8281
  13. 1681
  14. 9604
  15. 3844
  16. 1225
  17. 4356
  18. 9409
  19. 7921
  20. 1936
  21. 1089
  22. 3364
  23. 6241
  24. 6084
  25. 7569
  26. 6561
  27. 2809
  28. 1849
  29. 3025
  30. 1156
  31. 5041
  32. 1764
  33. 2704
  34. 2916
  35. 4489
  36. 9216
  37. 5776
  38. 9025
  39. 4761
  40. 3136

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