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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 257 · 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. 2.69² =
  3. 3.41² =
  4. 4.81² =
  5. 5.41² =
  6. 6.21² =
  7. 7.29² =
  8. 8.39² =
  9. 9.29² =
  10. 10.79² =
  11. 11.29² =
  12. 12.71² =
  13. 13.69² =
  14. 14.31² =
  15. 15.71² =
  16. 16.61² =
  17. 17.49² =
  18. 18.81² =
  19. 19.79² =
  20. 20.71² =
  21. 21.29² =
  22. 22.81² =
  23. 23.41² =
  24. 24.79² =
  25. 25.49² =
  26. 26.71² =
  27. 27.59² =
  28. 28.71² =
  29. 29.59² =
  30. 30.31² =
  31. 31.29² =
  32. 32.61² =
  33. 33.29² =
  34. 34.49² =
  35. 35.31² =
  36. 36.91² =
  37. 37.69² =
  38. 38.29² =
  39. 39.49² =
  40. 40.51² =

Answer key

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

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