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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 600 · 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. 2.49² =
  3. 3.29² =
  4. 4.19² =
  5. 5.79² =
  6. 6.19² =
  7. 7.89² =
  8. 8.69² =
  9. 9.31² =
  10. 10.29² =
  11. 11.31² =
  12. 12.19² =
  13. 13.19² =
  14. 14.29² =
  15. 15.81² =
  16. 16.31² =
  17. 17.81² =
  18. 18.61² =
  19. 19.71² =
  20. 20.69² =
  21. 21.21² =
  22. 22.41² =
  23. 23.51² =
  24. 24.59² =
  25. 25.29² =
  26. 26.91² =
  27. 27.59² =
  28. 28.71² =
  29. 29.69² =
  30. 30.71² =
  31. 31.89² =
  32. 32.31² =
  33. 33.21² =
  34. 34.69² =
  35. 35.69² =
  36. 36.39² =
  37. 37.51² =
  38. 38.21² =
  39. 39.61² =
  40. 40.41² =

Answer key

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

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