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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 513 · 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. 1.96² =
  2. 2.73² =
  3. 3.71² =
  4. 4.48² =
  5. 5.68² =
  6. 6.45² =
  7. 7.57² =
  8. 8.79² =
  9. 9.33² =
  10. 10.31² =
  11. 11.38² =
  12. 12.44² =
  13. 13.64² =
  14. 14.35² =
  15. 15.47² =
  16. 16.95² =
  17. 17.74² =
  18. 18.98² =
  19. 19.51² =
  20. 20.89² =
  21. 21.72² =
  22. 22.58² =
  23. 23.87² =
  24. 24.92² =
  25. 25.78² =
  26. 26.39² =
  27. 27.56² =
  28. 28.91² =
  29. 29.66² =
  30. 30.34² =
  31. 31.99² =
  32. 32.62² =
  33. 33.41² =
  34. 34.69² =
  35. 35.94² =
  36. 36.46² =
  37. 37.83² =
  38. 38.55² =
  39. 39.36² =
  40. 40.59² =

Answer key

  1. 9216
  2. 5329
  3. 5041
  4. 2304
  5. 4624
  6. 2025
  7. 3249
  8. 6241
  9. 1089
  10. 961
  11. 1444
  12. 1936
  13. 4096
  14. 1225
  15. 2209
  16. 9025
  17. 5476
  18. 9604
  19. 2601
  20. 7921
  21. 5184
  22. 3364
  23. 7569
  24. 8464
  25. 6084
  26. 1521
  27. 3136
  28. 8281
  29. 4356
  30. 1156
  31. 9801
  32. 3844
  33. 1681
  34. 4761
  35. 8836
  36. 2116
  37. 6889
  38. 3025
  39. 1296
  40. 3481

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