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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 70 · 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. 1.21² =
  2. 2.91² =
  3. 3.49² =
  4. 4.21² =
  5. 5.61² =
  6. 6.41² =
  7. 7.59² =
  8. 8.31² =
  9. 9.59² =
  10. 10.19² =
  11. 11.79² =
  12. 12.29² =
  13. 13.81² =
  14. 14.19² =
  15. 15.21² =
  16. 16.51² =
  17. 17.79² =
  18. 18.41² =
  19. 19.21² =
  20. 20.69² =
  21. 21.61² =
  22. 22.61² =
  23. 23.81² =
  24. 24.79² =
  25. 25.71² =
  26. 26.69² =
  27. 27.31² =
  28. 28.89² =
  29. 29.61² =
  30. 30.91² =
  31. 31.21² =
  32. 32.61² =
  33. 33.89² =
  34. 34.39² =
  35. 35.69² =
  36. 36.51² =
  37. 37.31² =
  38. 38.29² =
  39. 39.21² =
  40. 40.79² =

Answer key

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

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