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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 7 · 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. 1.53² =
  2. 2.58² =
  3. 3.79² =
  4. 4.51² =
  5. 5.66² =
  6. 6.64² =
  7. 7.69² =
  8. 8.61² =
  9. 9.84² =
  10. 10.78² =
  11. 11.62² =
  12. 12.74² =
  13. 13.71² =
  14. 14.63² =
  15. 15.93² =
  16. 16.31² =
  17. 17.39² =
  18. 18.43² =
  19. 19.56² =
  20. 20.33² =
  21. 21.87² =
  22. 22.99² =
  23. 23.38² =
  24. 24.59² =
  25. 25.57² =
  26. 26.34² =
  27. 27.49² =
  28. 28.41² =
  29. 29.88² =
  30. 30.48² =
  31. 31.75² =
  32. 32.83² =
  33. 33.55² =
  34. 34.35² =
  35. 35.82² =
  36. 36.91² =
  37. 37.95² =
  38. 38.81² =
  39. 39.44² =
  40. 40.47² =

Answer key

  1. 2809
  2. 3364
  3. 6241
  4. 2601
  5. 4356
  6. 4096
  7. 4761
  8. 3721
  9. 7056
  10. 6084
  11. 3844
  12. 5476
  13. 5041
  14. 3969
  15. 8649
  16. 961
  17. 1521
  18. 1849
  19. 3136
  20. 1089
  21. 7569
  22. 9801
  23. 1444
  24. 3481
  25. 3249
  26. 1156
  27. 2401
  28. 1681
  29. 7744
  30. 2304
  31. 5625
  32. 6889
  33. 3025
  34. 1225
  35. 6724
  36. 8281
  37. 9025
  38. 6561
  39. 1936
  40. 2209

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