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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 602 · 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. 1.65² =
  2. 2.36² =
  3. 3.48² =
  4. 4.45² =
  5. 5.41² =
  6. 6.46² =
  7. 7.88² =
  8. 8.57² =
  9. 9.84² =
  10. 10.42² =
  11. 11.72² =
  12. 12.96² =
  13. 13.86² =
  14. 14.87² =
  15. 15.99² =
  16. 16.75² =
  17. 17.89² =
  18. 18.83² =
  19. 19.93² =
  20. 20.32² =
  21. 21.51² =
  22. 22.34² =
  23. 23.61² =
  24. 24.64² =
  25. 25.66² =
  26. 26.78² =
  27. 27.55² =
  28. 28.63² =
  29. 29.81² =
  30. 30.35² =
  31. 31.79² =
  32. 32.47² =
  33. 33.33² =
  34. 34.69² =
  35. 35.59² =
  36. 36.94² =
  37. 37.91² =
  38. 38.71² =
  39. 39.53² =
  40. 40.43² =

Answer key

  1. 4225
  2. 1296
  3. 2304
  4. 2025
  5. 1681
  6. 2116
  7. 7744
  8. 3249
  9. 7056
  10. 1764
  11. 5184
  12. 9216
  13. 7396
  14. 7569
  15. 9801
  16. 5625
  17. 7921
  18. 6889
  19. 8649
  20. 1024
  21. 2601
  22. 1156
  23. 3721
  24. 4096
  25. 4356
  26. 6084
  27. 3025
  28. 3969
  29. 6561
  30. 1225
  31. 6241
  32. 2209
  33. 1089
  34. 4761
  35. 3481
  36. 8836
  37. 8281
  38. 5041
  39. 2809
  40. 1849

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