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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 605 · 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. 1.47² =
  2. 2.81² =
  3. 3.71² =
  4. 4.59² =
  5. 5.36² =
  6. 6.44² =
  7. 7.98² =
  8. 8.62² =
  9. 9.52² =
  10. 10.41² =
  11. 11.89² =
  12. 12.43² =
  13. 13.82² =
  14. 14.46² =
  15. 15.32² =
  16. 16.86² =
  17. 17.76² =
  18. 18.93² =
  19. 19.39² =
  20. 20.72² =
  21. 21.66² =
  22. 22.35² =
  23. 23.61² =
  24. 24.99² =
  25. 25.84² =
  26. 26.74² =
  27. 27.91² =
  28. 28.37² =
  29. 29.45² =
  30. 30.57² =
  31. 31.68² =
  32. 32.94² =
  33. 33.87² =
  34. 34.33² =
  35. 35.34² =
  36. 36.53² =
  37. 37.97² =
  38. 38.38² =
  39. 39.48² =
  40. 40.51² =

Answer key

  1. 2209
  2. 6561
  3. 5041
  4. 3481
  5. 1296
  6. 1936
  7. 9604
  8. 3844
  9. 2704
  10. 1681
  11. 7921
  12. 1849
  13. 6724
  14. 2116
  15. 1024
  16. 7396
  17. 5776
  18. 8649
  19. 1521
  20. 5184
  21. 4356
  22. 1225
  23. 3721
  24. 9801
  25. 7056
  26. 5476
  27. 8281
  28. 1369
  29. 2025
  30. 3249
  31. 4624
  32. 8836
  33. 7569
  34. 1089
  35. 1156
  36. 2809
  37. 9409
  38. 1444
  39. 2304
  40. 2601

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