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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 57 · 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. 1.98² =
  2. 2.54² =
  3. 3.61² =
  4. 4.33² =
  5. 5.94² =
  6. 6.93² =
  7. 7.51² =
  8. 8.31² =
  9. 9.44² =
  10. 10.66² =
  11. 11.71² =
  12. 12.45² =
  13. 13.48² =
  14. 14.67² =
  15. 15.72² =
  16. 16.92² =
  17. 17.52² =
  18. 18.88² =
  19. 19.95² =
  20. 20.56² =
  21. 21.35² =
  22. 22.46² =
  23. 23.83² =
  24. 24.34² =
  25. 25.37² =
  26. 26.84² =
  27. 27.53² =
  28. 28.36² =
  29. 29.58² =
  30. 30.68² =
  31. 31.87² =
  32. 32.78² =
  33. 33.77² =
  34. 34.41² =
  35. 35.43² =
  36. 36.86² =
  37. 37.69² =
  38. 38.42² =
  39. 39.99² =
  40. 40.79² =

Answer key

  1. 9604
  2. 2916
  3. 3721
  4. 1089
  5. 8836
  6. 8649
  7. 2601
  8. 961
  9. 1936
  10. 4356
  11. 5041
  12. 2025
  13. 2304
  14. 4489
  15. 5184
  16. 8464
  17. 2704
  18. 7744
  19. 9025
  20. 3136
  21. 1225
  22. 2116
  23. 6889
  24. 1156
  25. 1369
  26. 7056
  27. 2809
  28. 1296
  29. 3364
  30. 4624
  31. 7569
  32. 6084
  33. 5929
  34. 1681
  35. 1849
  36. 7396
  37. 4761
  38. 1764
  39. 9801
  40. 6241

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