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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 616 · 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. 2.49² =
  3. 3.79² =
  4. 4.71² =
  5. 5.51² =
  6. 6.69² =
  7. 7.69² =
  8. 8.69² =
  9. 9.39² =
  10. 10.79² =
  11. 11.69² =
  12. 12.31² =
  13. 13.21² =
  14. 14.81² =
  15. 15.71² =
  16. 16.49² =
  17. 17.51² =
  18. 18.81² =
  19. 19.79² =
  20. 20.69² =
  21. 21.49² =
  22. 22.69² =
  23. 23.61² =
  24. 24.29² =
  25. 25.81² =
  26. 26.51² =
  27. 27.79² =
  28. 28.51² =
  29. 29.41² =
  30. 30.49² =
  31. 31.71² =
  32. 32.41² =
  33. 33.39² =
  34. 34.89² =
  35. 35.19² =
  36. 36.21² =
  37. 37.89² =
  38. 38.29² =
  39. 39.61² =
  40. 40.79² =

Answer key

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

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