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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 429 · 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. 1.71² =
  2. 2.55² =
  3. 3.39² =
  4. 4.34² =
  5. 5.31² =
  6. 6.56² =
  7. 7.32² =
  8. 8.68² =
  9. 9.94² =
  10. 10.61² =
  11. 11.63² =
  12. 12.97² =
  13. 13.95² =
  14. 14.57² =
  15. 15.45² =
  16. 16.67² =
  17. 17.53² =
  18. 18.69² =
  19. 19.46² =
  20. 20.75² =
  21. 21.98² =
  22. 22.72² =
  23. 23.84² =
  24. 24.43² =
  25. 25.96² =
  26. 26.37² =
  27. 27.88² =
  28. 28.41² =
  29. 29.35² =
  30. 30.36² =
  31. 31.51² =
  32. 32.58² =
  33. 33.78² =
  34. 34.54² =
  35. 35.66² =
  36. 36.92² =
  37. 37.38² =
  38. 38.74² =
  39. 39.86² =
  40. 40.49² =

Answer key

  1. 5041
  2. 3025
  3. 1521
  4. 1156
  5. 961
  6. 3136
  7. 1024
  8. 4624
  9. 8836
  10. 3721
  11. 3969
  12. 9409
  13. 9025
  14. 3249
  15. 2025
  16. 4489
  17. 2809
  18. 4761
  19. 2116
  20. 5625
  21. 9604
  22. 5184
  23. 7056
  24. 1849
  25. 9216
  26. 1369
  27. 7744
  28. 1681
  29. 1225
  30. 1296
  31. 2601
  32. 3364
  33. 6084
  34. 2916
  35. 4356
  36. 8464
  37. 1444
  38. 5476
  39. 7396
  40. 2401

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