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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 118 · 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. 1.61² =
  2. 2.51² =
  3. 3.59² =
  4. 4.61² =
  5. 5.29² =
  6. 6.41² =
  7. 7.31² =
  8. 8.89² =
  9. 9.69² =
  10. 10.69² =
  11. 11.79² =
  12. 12.19² =
  13. 13.41² =
  14. 14.19² =
  15. 15.49² =
  16. 16.91² =
  17. 17.69² =
  18. 18.89² =
  19. 19.69² =
  20. 20.21² =
  21. 21.39² =
  22. 22.71² =
  23. 23.29² =
  24. 24.29² =
  25. 25.51² =
  26. 26.29² =
  27. 27.29² =
  28. 28.19² =
  29. 29.21² =
  30. 30.59² =
  31. 31.49² =
  32. 32.71² =
  33. 33.21² =
  34. 34.61² =
  35. 35.79² =
  36. 36.39² =
  37. 37.21² =
  38. 38.89² =
  39. 39.91² =
  40. 40.51² =

Answer key

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

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