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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 883 · 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. 1.83² =
  2. 2.82² =
  3. 3.48² =
  4. 4.66² =
  5. 5.65² =
  6. 6.86² =
  7. 7.33² =
  8. 8.74² =
  9. 9.96² =
  10. 10.38² =
  11. 11.71² =
  12. 12.97² =
  13. 13.44² =
  14. 14.69² =
  15. 15.47² =
  16. 16.31² =
  17. 17.49² =
  18. 18.32² =
  19. 19.98² =
  20. 20.81² =
  21. 21.84² =
  22. 22.72² =
  23. 23.34² =
  24. 24.35² =
  25. 25.78² =
  26. 26.46² =
  27. 27.79² =
  28. 28.88² =
  29. 29.62² =
  30. 30.61² =
  31. 31.54² =
  32. 32.56² =
  33. 33.67² =
  34. 34.68² =
  35. 35.37² =
  36. 36.93² =
  37. 37.64² =
  38. 38.41² =
  39. 39.63² =
  40. 40.91² =

Answer key

  1. 6889
  2. 6724
  3. 2304
  4. 4356
  5. 4225
  6. 7396
  7. 1089
  8. 5476
  9. 9216
  10. 1444
  11. 5041
  12. 9409
  13. 1936
  14. 4761
  15. 2209
  16. 961
  17. 2401
  18. 1024
  19. 9604
  20. 6561
  21. 7056
  22. 5184
  23. 1156
  24. 1225
  25. 6084
  26. 2116
  27. 6241
  28. 7744
  29. 3844
  30. 3721
  31. 2916
  32. 3136
  33. 4489
  34. 4624
  35. 1369
  36. 8649
  37. 4096
  38. 1681
  39. 3969
  40. 8281

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