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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 119 · 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. 2.91² =
  3. 3.31² =
  4. 4.49² =
  5. 5.79² =
  6. 6.89² =
  7. 7.81² =
  8. 8.69² =
  9. 9.89² =
  10. 10.79² =
  11. 11.79² =
  12. 12.41² =
  13. 13.29² =
  14. 14.29² =
  15. 15.31² =
  16. 16.29² =
  17. 17.71² =
  18. 18.71² =
  19. 19.51² =
  20. 20.81² =
  21. 21.19² =
  22. 22.41² =
  23. 23.71² =
  24. 24.39² =
  25. 25.91² =
  26. 26.29² =
  27. 27.61² =
  28. 28.59² =
  29. 29.39² =
  30. 30.39² =
  31. 31.21² =
  32. 32.61² =
  33. 33.79² =
  34. 34.61² =
  35. 35.59² =
  36. 36.51² =
  37. 37.89² =
  38. 38.21² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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