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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 351 · 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. 2.41² =
  3. 3.69² =
  4. 4.19² =
  5. 5.81² =
  6. 6.29² =
  7. 7.41² =
  8. 8.49² =
  9. 9.71² =
  10. 10.61² =
  11. 11.39² =
  12. 12.19² =
  13. 13.79² =
  14. 14.19² =
  15. 15.29² =
  16. 16.79² =
  17. 17.59² =
  18. 18.19² =
  19. 19.31² =
  20. 20.69² =
  21. 21.19² =
  22. 22.19² =
  23. 23.59² =
  24. 24.51² =
  25. 25.91² =
  26. 26.61² =
  27. 27.59² =
  28. 28.69² =
  29. 29.21² =
  30. 30.61² =
  31. 31.31² =
  32. 32.59² =
  33. 33.59² =
  34. 34.89² =
  35. 35.79² =
  36. 36.39² =
  37. 37.21² =
  38. 38.59² =
  39. 39.41² =
  40. 40.49² =

Answer key

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

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