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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 935 · 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. 2.68² =
  3. 3.73² =
  4. 4.75² =
  5. 5.93² =
  6. 6.51² =
  7. 7.91² =
  8. 8.72² =
  9. 9.38² =
  10. 10.96² =
  11. 11.59² =
  12. 12.63² =
  13. 13.84² =
  14. 14.85² =
  15. 15.47² =
  16. 16.44² =
  17. 17.99² =
  18. 18.36² =
  19. 19.61² =
  20. 20.97² =
  21. 21.37² =
  22. 22.86² =
  23. 23.34² =
  24. 24.79² =
  25. 25.42² =
  26. 26.66² =
  27. 27.76² =
  28. 28.45² =
  29. 29.74² =
  30. 30.83² =
  31. 31.81² =
  32. 32.55² =
  33. 33.58² =
  34. 34.87² =
  35. 35.48² =
  36. 36.95² =
  37. 37.71² =
  38. 38.69² =
  39. 39.52² =
  40. 40.78² =

Answer key

  1. 4489
  2. 4624
  3. 5329
  4. 5625
  5. 8649
  6. 2601
  7. 8281
  8. 5184
  9. 1444
  10. 9216
  11. 3481
  12. 3969
  13. 7056
  14. 7225
  15. 2209
  16. 1936
  17. 9801
  18. 1296
  19. 3721
  20. 9409
  21. 1369
  22. 7396
  23. 1156
  24. 6241
  25. 1764
  26. 4356
  27. 5776
  28. 2025
  29. 5476
  30. 6889
  31. 6561
  32. 3025
  33. 3364
  34. 7569
  35. 2304
  36. 9025
  37. 5041
  38. 4761
  39. 2704
  40. 6084

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