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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 359 · 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. 1.41² =
  2. 2.19² =
  3. 3.89² =
  4. 4.69² =
  5. 5.19² =
  6. 6.29² =
  7. 7.81² =
  8. 8.91² =
  9. 9.31² =
  10. 10.69² =
  11. 11.71² =
  12. 12.31² =
  13. 13.51² =
  14. 14.31² =
  15. 15.89² =
  16. 16.39² =
  17. 17.31² =
  18. 18.31² =
  19. 19.91² =
  20. 20.61² =
  21. 21.61² =
  22. 22.29² =
  23. 23.89² =
  24. 24.79² =
  25. 25.71² =
  26. 26.79² =
  27. 27.79² =
  28. 28.21² =
  29. 29.49² =
  30. 30.61² =
  31. 31.91² =
  32. 32.39² =
  33. 33.29² =
  34. 34.91² =
  35. 35.71² =
  36. 36.19² =
  37. 37.31² =
  38. 38.21² =
  39. 39.19² =
  40. 40.81² =

Answer key

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

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