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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 84 · 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. 1.52² =
  2. 2.53² =
  3. 3.74² =
  4. 4.64² =
  5. 5.79² =
  6. 6.87² =
  7. 7.85² =
  8. 8.71² =
  9. 9.42² =
  10. 10.96² =
  11. 11.49² =
  12. 12.45² =
  13. 13.86² =
  14. 14.93² =
  15. 15.68² =
  16. 16.82² =
  17. 17.57² =
  18. 18.46² =
  19. 19.31² =
  20. 20.94² =
  21. 21.91² =
  22. 22.55² =
  23. 23.35² =
  24. 24.78² =
  25. 25.43² =
  26. 26.59² =
  27. 27.97² =
  28. 28.41² =
  29. 29.95² =
  30. 30.63² =
  31. 31.69² =
  32. 32.48² =
  33. 33.37² =
  34. 34.98² =
  35. 35.36² =
  36. 36.84² =
  37. 37.73² =
  38. 38.72² =
  39. 39.32² =
  40. 40.61² =

Answer key

  1. 2704
  2. 2809
  3. 5476
  4. 4096
  5. 6241
  6. 7569
  7. 7225
  8. 5041
  9. 1764
  10. 9216
  11. 2401
  12. 2025
  13. 7396
  14. 8649
  15. 4624
  16. 6724
  17. 3249
  18. 2116
  19. 961
  20. 8836
  21. 8281
  22. 3025
  23. 1225
  24. 6084
  25. 1849
  26. 3481
  27. 9409
  28. 1681
  29. 9025
  30. 3969
  31. 4761
  32. 2304
  33. 1369
  34. 9604
  35. 1296
  36. 7056
  37. 5329
  38. 5184
  39. 1024
  40. 3721

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