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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 435 · 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. 1.49² =
  2. 2.51² =
  3. 3.79² =
  4. 4.29² =
  5. 5.79² =
  6. 6.89² =
  7. 7.41² =
  8. 8.59² =
  9. 9.69² =
  10. 10.71² =
  11. 11.69² =
  12. 12.61² =
  13. 13.91² =
  14. 14.19² =
  15. 15.59² =
  16. 16.19² =
  17. 17.81² =
  18. 18.31² =
  19. 19.49² =
  20. 20.71² =
  21. 21.19² =
  22. 22.61² =
  23. 23.69² =
  24. 24.31² =
  25. 25.69² =
  26. 26.81² =
  27. 27.41² =
  28. 28.49² =
  29. 29.59² =
  30. 30.81² =
  31. 31.19² =
  32. 32.81² =
  33. 33.41² =
  34. 34.39² =
  35. 35.89² =
  36. 36.71² =
  37. 37.19² =
  38. 38.89² =
  39. 39.21² =
  40. 40.49² =

Answer key

  1. 2401
  2. 2601
  3. 6241
  4. 841
  5. 6241
  6. 7921
  7. 1681
  8. 3481
  9. 4761
  10. 5041
  11. 4761
  12. 3721
  13. 8281
  14. 361
  15. 3481
  16. 361
  17. 6561
  18. 961
  19. 2401
  20. 5041
  21. 361
  22. 3721
  23. 4761
  24. 961
  25. 4761
  26. 6561
  27. 1681
  28. 2401
  29. 3481
  30. 6561
  31. 361
  32. 6561
  33. 1681
  34. 1521
  35. 7921
  36. 5041
  37. 361
  38. 7921
  39. 441
  40. 2401

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