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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 550 · 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. 1.19² =
  2. 2.89² =
  3. 3.91² =
  4. 4.49² =
  5. 5.51² =
  6. 6.29² =
  7. 7.19² =
  8. 8.79² =
  9. 9.31² =
  10. 10.79² =
  11. 11.49² =
  12. 12.51² =
  13. 13.19² =
  14. 14.21² =
  15. 15.39² =
  16. 16.51² =
  17. 17.89² =
  18. 18.41² =
  19. 19.39² =
  20. 20.91² =
  21. 21.29² =
  22. 22.61² =
  23. 23.71² =
  24. 24.39² =
  25. 25.51² =
  26. 26.91² =
  27. 27.51² =
  28. 28.29² =
  29. 29.21² =
  30. 30.41² =
  31. 31.81² =
  32. 32.71² =
  33. 33.79² =
  34. 34.21² =
  35. 35.79² =
  36. 36.41² =
  37. 37.69² =
  38. 38.31² =
  39. 39.39² =
  40. 40.41² =

Answer key

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

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