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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 417 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.81² =
  2. 2.41² =
  3. 3.79² =
  4. 4.79² =
  5. 5.71² =
  6. 6.91² =
  7. 7.81² =
  8. 8.21² =
  9. 9.91² =
  10. 10.69² =
  11. 11.81² =
  12. 12.69² =
  13. 13.71² =
  14. 14.59² =
  15. 15.89² =
  16. 16.69² =
  17. 17.59² =
  18. 18.79² =
  19. 19.71² =
  20. 20.31² =
  21. 21.79² =
  22. 22.49² =
  23. 23.39² =
  24. 24.41² =
  25. 25.41² =
  26. 26.49² =
  27. 27.19² =
  28. 28.91² =
  29. 29.29² =
  30. 30.89² =
  31. 31.91² =
  32. 32.59² =
  33. 33.49² =
  34. 34.71² =
  35. 35.71² =
  36. 36.81² =
  37. 37.31² =
  38. 38.69² =
  39. 39.81² =
  40. 40.91² =

Answer key

  1. 6561
  2. 1681
  3. 6241
  4. 6241
  5. 5041
  6. 8281
  7. 6561
  8. 441
  9. 8281
  10. 4761
  11. 6561
  12. 4761
  13. 5041
  14. 3481
  15. 7921
  16. 4761
  17. 3481
  18. 6241
  19. 5041
  20. 961
  21. 6241
  22. 2401
  23. 1521
  24. 1681
  25. 1681
  26. 2401
  27. 361
  28. 8281
  29. 841
  30. 7921
  31. 8281
  32. 3481
  33. 2401
  34. 5041
  35. 5041
  36. 6561
  37. 961
  38. 4761
  39. 6561
  40. 8281

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