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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 333 · 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. 1.79² =
  2. 2.21² =
  3. 3.79² =
  4. 4.69² =
  5. 5.29² =
  6. 6.59² =
  7. 7.61² =
  8. 8.91² =
  9. 9.81² =
  10. 10.91² =
  11. 11.91² =
  12. 12.51² =
  13. 13.59² =
  14. 14.31² =
  15. 15.79² =
  16. 16.61² =
  17. 17.59² =
  18. 18.59² =
  19. 19.91² =
  20. 20.31² =
  21. 21.49² =
  22. 22.49² =
  23. 23.31² =
  24. 24.19² =
  25. 25.31² =
  26. 26.91² =
  27. 27.89² =
  28. 28.19² =
  29. 29.19² =
  30. 30.41² =
  31. 31.61² =
  32. 32.71² =
  33. 33.39² =
  34. 34.91² =
  35. 35.29² =
  36. 36.39² =
  37. 37.49² =
  38. 38.19² =
  39. 39.91² =
  40. 40.49² =

Answer key

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

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