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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 336 · 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. 1.41² =
  2. 2.49² =
  3. 3.29² =
  4. 4.71² =
  5. 5.79² =
  6. 6.69² =
  7. 7.89² =
  8. 8.21² =
  9. 9.61² =
  10. 10.81² =
  11. 11.29² =
  12. 12.69² =
  13. 13.29² =
  14. 14.21² =
  15. 15.79² =
  16. 16.29² =
  17. 17.71² =
  18. 18.21² =
  19. 19.61² =
  20. 20.41² =
  21. 21.31² =
  22. 22.59² =
  23. 23.31² =
  24. 24.91² =
  25. 25.31² =
  26. 26.21² =
  27. 27.51² =
  28. 28.71² =
  29. 29.31² =
  30. 30.39² =
  31. 31.69² =
  32. 32.71² =
  33. 33.61² =
  34. 34.59² =
  35. 35.91² =
  36. 36.81² =
  37. 37.71² =
  38. 38.91² =
  39. 39.49² =
  40. 40.71² =

Answer key

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

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