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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 106 · 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. 1.77² =
  2. 2.33² =
  3. 3.89² =
  4. 4.38² =
  5. 5.58² =
  6. 6.84² =
  7. 7.76² =
  8. 8.67² =
  9. 9.78² =
  10. 10.93² =
  11. 11.39² =
  12. 12.42² =
  13. 13.66² =
  14. 14.85² =
  15. 15.94² =
  16. 16.57² =
  17. 17.91² =
  18. 18.82² =
  19. 19.97² =
  20. 20.86² =
  21. 21.32² =
  22. 22.44² =
  23. 23.31² =
  24. 24.96² =
  25. 25.92² =
  26. 26.99² =
  27. 27.71² =
  28. 28.69² =
  29. 29.56² =
  30. 30.55² =
  31. 31.41² =
  32. 32.61² =
  33. 33.72² =
  34. 34.74² =
  35. 35.63² =
  36. 36.34² =
  37. 37.47² =
  38. 38.54² =
  39. 39.43² =
  40. 40.53² =

Answer key

  1. 5929
  2. 1089
  3. 7921
  4. 1444
  5. 3364
  6. 7056
  7. 5776
  8. 4489
  9. 6084
  10. 8649
  11. 1521
  12. 1764
  13. 4356
  14. 7225
  15. 8836
  16. 3249
  17. 8281
  18. 6724
  19. 9409
  20. 7396
  21. 1024
  22. 1936
  23. 961
  24. 9216
  25. 8464
  26. 9801
  27. 5041
  28. 4761
  29. 3136
  30. 3025
  31. 1681
  32. 3721
  33. 5184
  34. 5476
  35. 3969
  36. 1156
  37. 2209
  38. 2916
  39. 1849
  40. 2809

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