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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 408 · 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. 1.51² =
  2. 2.44² =
  3. 3.95² =
  4. 4.34² =
  5. 5.33² =
  6. 6.41² =
  7. 7.98² =
  8. 8.57² =
  9. 9.78² =
  10. 10.32² =
  11. 11.38² =
  12. 12.91² =
  13. 13.69² =
  14. 14.72² =
  15. 15.77² =
  16. 16.83² =
  17. 17.81² =
  18. 18.92² =
  19. 19.46² =
  20. 20.61² =
  21. 21.93² =
  22. 22.67² =
  23. 23.56² =
  24. 24.39² =
  25. 25.54² =
  26. 26.71² =
  27. 27.76² =
  28. 28.43² =
  29. 29.58² =
  30. 30.35² =
  31. 31.42² =
  32. 32.89² =
  33. 33.62² =
  34. 34.64² =
  35. 35.66² =
  36. 36.96² =
  37. 37.45² =
  38. 38.55² =
  39. 39.75² =
  40. 40.48² =

Answer key

  1. 2601
  2. 1936
  3. 9025
  4. 1156
  5. 1089
  6. 1681
  7. 9604
  8. 3249
  9. 6084
  10. 1024
  11. 1444
  12. 8281
  13. 4761
  14. 5184
  15. 5929
  16. 6889
  17. 6561
  18. 8464
  19. 2116
  20. 3721
  21. 8649
  22. 4489
  23. 3136
  24. 1521
  25. 2916
  26. 5041
  27. 5776
  28. 1849
  29. 3364
  30. 1225
  31. 1764
  32. 7921
  33. 3844
  34. 4096
  35. 4356
  36. 9216
  37. 2025
  38. 3025
  39. 5625
  40. 2304

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