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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 255 · 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. 1.39² =
  2. 2.49² =
  3. 3.91² =
  4. 4.61² =
  5. 5.31² =
  6. 6.19² =
  7. 7.19² =
  8. 8.29² =
  9. 9.59² =
  10. 10.51² =
  11. 11.29² =
  12. 12.59² =
  13. 13.89² =
  14. 14.91² =
  15. 15.21² =
  16. 16.71² =
  17. 17.59² =
  18. 18.41² =
  19. 19.41² =
  20. 20.89² =
  21. 21.81² =
  22. 22.71² =
  23. 23.61² =
  24. 24.59² =
  25. 25.39² =
  26. 26.29² =
  27. 27.91² =
  28. 28.79² =
  29. 29.79² =
  30. 30.71² =
  31. 31.89² =
  32. 32.69² =
  33. 33.51² =
  34. 34.71² =
  35. 35.21² =
  36. 36.89² =
  37. 37.69² =
  38. 38.69² =
  39. 39.41² =
  40. 40.29² =

Answer key

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

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