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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 51 · 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. 1.31² =
  2. 2.49² =
  3. 3.29² =
  4. 4.69² =
  5. 5.51² =
  6. 6.21² =
  7. 7.89² =
  8. 8.91² =
  9. 9.19² =
  10. 10.29² =
  11. 11.19² =
  12. 12.89² =
  13. 13.51² =
  14. 14.79² =
  15. 15.49² =
  16. 16.71² =
  17. 17.31² =
  18. 18.19² =
  19. 19.61² =
  20. 20.61² =
  21. 21.29² =
  22. 22.81² =
  23. 23.91² =
  24. 24.49² =
  25. 25.79² =
  26. 26.59² =
  27. 27.29² =
  28. 28.21² =
  29. 29.69² =
  30. 30.69² =
  31. 31.19² =
  32. 32.19² =
  33. 33.89² =
  34. 34.71² =
  35. 35.61² =
  36. 36.41² =
  37. 37.19² =
  38. 38.21² =
  39. 39.39² =
  40. 40.81² =

Answer key

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

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