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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 667 · 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. 1.49² =
  2. 2.19² =
  3. 3.19² =
  4. 4.79² =
  5. 5.81² =
  6. 6.69² =
  7. 7.31² =
  8. 8.19² =
  9. 9.41² =
  10. 10.19² =
  11. 11.61² =
  12. 12.79² =
  13. 13.31² =
  14. 14.31² =
  15. 15.59² =
  16. 16.79² =
  17. 17.21² =
  18. 18.31² =
  19. 19.91² =
  20. 20.49² =
  21. 21.21² =
  22. 22.81² =
  23. 23.61² =
  24. 24.59² =
  25. 25.89² =
  26. 26.91² =
  27. 27.51² =
  28. 28.41² =
  29. 29.39² =
  30. 30.79² =
  31. 31.89² =
  32. 32.31² =
  33. 33.71² =
  34. 34.19² =
  35. 35.19² =
  36. 36.81² =
  37. 37.71² =
  38. 38.59² =
  39. 39.49² =
  40. 40.29² =

Answer key

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

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