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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 225 · 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. 1.39² =
  2. 2.83² =
  3. 3.61² =
  4. 4.91² =
  5. 5.71² =
  6. 6.33² =
  7. 7.97² =
  8. 8.41² =
  9. 9.82² =
  10. 10.44² =
  11. 11.75² =
  12. 12.77² =
  13. 13.54² =
  14. 14.53² =
  15. 15.37² =
  16. 16.74² =
  17. 17.68² =
  18. 18.98² =
  19. 19.51² =
  20. 20.67² =
  21. 21.62² =
  22. 22.69² =
  23. 23.93² =
  24. 24.34² =
  25. 25.58² =
  26. 26.43² =
  27. 27.79² =
  28. 28.46² =
  29. 29.48² =
  30. 30.56² =
  31. 31.36² =
  32. 32.72² =
  33. 33.49² =
  34. 34.38² =
  35. 35.66² =
  36. 36.92² =
  37. 37.81² =
  38. 38.47² =
  39. 39.78² =
  40. 40.88² =

Answer key

  1. 1521
  2. 6889
  3. 3721
  4. 8281
  5. 5041
  6. 1089
  7. 9409
  8. 1681
  9. 6724
  10. 1936
  11. 5625
  12. 5929
  13. 2916
  14. 2809
  15. 1369
  16. 5476
  17. 4624
  18. 9604
  19. 2601
  20. 4489
  21. 3844
  22. 4761
  23. 8649
  24. 1156
  25. 3364
  26. 1849
  27. 6241
  28. 2116
  29. 2304
  30. 3136
  31. 1296
  32. 5184
  33. 2401
  34. 1444
  35. 4356
  36. 8464
  37. 6561
  38. 2209
  39. 6084
  40. 7744

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