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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 687 · 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. 2.49² =
  3. 3.39² =
  4. 4.59² =
  5. 5.79² =
  6. 6.29² =
  7. 7.41² =
  8. 8.69² =
  9. 9.31² =
  10. 10.91² =
  11. 11.19² =
  12. 12.21² =
  13. 13.89² =
  14. 14.91² =
  15. 15.59² =
  16. 16.79² =
  17. 17.79² =
  18. 18.59² =
  19. 19.31² =
  20. 20.31² =
  21. 21.21² =
  22. 22.81² =
  23. 23.39² =
  24. 24.71² =
  25. 25.71² =
  26. 26.71² =
  27. 27.91² =
  28. 28.29² =
  29. 29.31² =
  30. 30.19² =
  31. 31.19² =
  32. 32.71² =
  33. 33.61² =
  34. 34.69² =
  35. 35.71² =
  36. 36.49² =
  37. 37.39² =
  38. 38.51² =
  39. 39.49² =
  40. 40.71² =

Answer key

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

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