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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 767 · 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. 1.64² =
  2. 2.88² =
  3. 3.61² =
  4. 4.93² =
  5. 5.41² =
  6. 6.45² =
  7. 7.69² =
  8. 8.34² =
  9. 9.73² =
  10. 10.92² =
  11. 11.81² =
  12. 12.58² =
  13. 13.51² =
  14. 14.66² =
  15. 15.91² =
  16. 16.36² =
  17. 17.48² =
  18. 18.32² =
  19. 19.35² =
  20. 20.33² =
  21. 21.71² =
  22. 22.59² =
  23. 23.31² =
  24. 24.94² =
  25. 25.79² =
  26. 26.72² =
  27. 27.98² =
  28. 28.55² =
  29. 29.76² =
  30. 30.84² =
  31. 31.96² =
  32. 32.44² =
  33. 33.37² =
  34. 34.75² =
  35. 35.82² =
  36. 36.95² =
  37. 37.43² =
  38. 38.68² =
  39. 39.57² =
  40. 40.46² =

Answer key

  1. 4096
  2. 7744
  3. 3721
  4. 8649
  5. 1681
  6. 2025
  7. 4761
  8. 1156
  9. 5329
  10. 8464
  11. 6561
  12. 3364
  13. 2601
  14. 4356
  15. 8281
  16. 1296
  17. 2304
  18. 1024
  19. 1225
  20. 1089
  21. 5041
  22. 3481
  23. 961
  24. 8836
  25. 6241
  26. 5184
  27. 9604
  28. 3025
  29. 5776
  30. 7056
  31. 9216
  32. 1936
  33. 1369
  34. 5625
  35. 6724
  36. 9025
  37. 1849
  38. 4624
  39. 3249
  40. 2116

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