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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 719 · 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. 2.54² =
  3. 3.44² =
  4. 4.74² =
  5. 5.86² =
  6. 6.45² =
  7. 7.61² =
  8. 8.55² =
  9. 9.95² =
  10. 10.81² =
  11. 11.62² =
  12. 12.52² =
  13. 13.79² =
  14. 14.67² =
  15. 15.46² =
  16. 16.92² =
  17. 17.32² =
  18. 18.37² =
  19. 19.72² =
  20. 20.38² =
  21. 21.97² =
  22. 22.39² =
  23. 23.91² =
  24. 24.31² =
  25. 25.66² =
  26. 26.53² =
  27. 27.48² =
  28. 28.33² =
  29. 29.88² =
  30. 30.98² =
  31. 31.41² =
  32. 32.51² =
  33. 33.42² =
  34. 34.68² =
  35. 35.71² =
  36. 36.78² =
  37. 37.41² =
  38. 38.35² =
  39. 39.63² =
  40. 40.93² =

Answer key

  1. 5929
  2. 2916
  3. 1936
  4. 5476
  5. 7396
  6. 2025
  7. 3721
  8. 3025
  9. 9025
  10. 6561
  11. 3844
  12. 2704
  13. 6241
  14. 4489
  15. 2116
  16. 8464
  17. 1024
  18. 1369
  19. 5184
  20. 1444
  21. 9409
  22. 1521
  23. 8281
  24. 961
  25. 4356
  26. 2809
  27. 2304
  28. 1089
  29. 7744
  30. 9604
  31. 1681
  32. 2601
  33. 1764
  34. 4624
  35. 5041
  36. 6084
  37. 1681
  38. 1225
  39. 3969
  40. 8649

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