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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 446 · 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. 1.76² =
  2. 2.38² =
  3. 3.36² =
  4. 4.72² =
  5. 5.33² =
  6. 6.84² =
  7. 7.43² =
  8. 8.57² =
  9. 9.98² =
  10. 10.92² =
  11. 11.55² =
  12. 12.88² =
  13. 13.44² =
  14. 14.83² =
  15. 15.81² =
  16. 16.69² =
  17. 17.85² =
  18. 18.48² =
  19. 19.35² =
  20. 20.59² =
  21. 21.91² =
  22. 22.71² =
  23. 23.32² =
  24. 24.78² =
  25. 25.93² =
  26. 26.34² =
  27. 27.89² =
  28. 28.79² =
  29. 29.51² =
  30. 30.94² =
  31. 31.77² =
  32. 32.37² =
  33. 33.74² =
  34. 34.75² =
  35. 35.45² =
  36. 36.41² =
  37. 37.56² =
  38. 38.66² =
  39. 39.73² =
  40. 40.96² =

Answer key

  1. 5776
  2. 1444
  3. 1296
  4. 5184
  5. 1089
  6. 7056
  7. 1849
  8. 3249
  9. 9604
  10. 8464
  11. 3025
  12. 7744
  13. 1936
  14. 6889
  15. 6561
  16. 4761
  17. 7225
  18. 2304
  19. 1225
  20. 3481
  21. 8281
  22. 5041
  23. 1024
  24. 6084
  25. 8649
  26. 1156
  27. 7921
  28. 6241
  29. 2601
  30. 8836
  31. 5929
  32. 1369
  33. 5476
  34. 5625
  35. 2025
  36. 1681
  37. 3136
  38. 4356
  39. 5329
  40. 9216

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