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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 288 · 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. 1.67² =
  2. 2.56² =
  3. 3.46² =
  4. 4.38² =
  5. 5.92² =
  6. 6.94² =
  7. 7.77² =
  8. 8.45² =
  9. 9.36² =
  10. 10.98² =
  11. 11.32² =
  12. 12.52² =
  13. 13.37² =
  14. 14.57² =
  15. 15.83² =
  16. 16.79² =
  17. 17.31² =
  18. 18.81² =
  19. 19.88² =
  20. 20.71² =
  21. 21.48² =
  22. 22.39² =
  23. 23.72² =
  24. 24.96² =
  25. 25.51² =
  26. 26.43² =
  27. 27.55² =
  28. 28.61² =
  29. 29.74² =
  30. 30.63² =
  31. 31.64² =
  32. 32.66² =
  33. 33.78² =
  34. 34.59² =
  35. 35.58² =
  36. 36.44² =
  37. 37.33² =
  38. 38.62² =
  39. 39.73² =
  40. 40.82² =

Answer key

  1. 4489
  2. 3136
  3. 2116
  4. 1444
  5. 8464
  6. 8836
  7. 5929
  8. 2025
  9. 1296
  10. 9604
  11. 1024
  12. 2704
  13. 1369
  14. 3249
  15. 6889
  16. 6241
  17. 961
  18. 6561
  19. 7744
  20. 5041
  21. 2304
  22. 1521
  23. 5184
  24. 9216
  25. 2601
  26. 1849
  27. 3025
  28. 3721
  29. 5476
  30. 3969
  31. 4096
  32. 4356
  33. 6084
  34. 3481
  35. 3364
  36. 1936
  37. 1089
  38. 3844
  39. 5329
  40. 6724

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