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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 802 · 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. 1.51² =
  2. 2.81² =
  3. 3.21² =
  4. 4.79² =
  5. 5.71² =
  6. 6.31² =
  7. 7.41² =
  8. 8.61² =
  9. 9.31² =
  10. 10.21² =
  11. 11.69² =
  12. 12.39² =
  13. 13.89² =
  14. 14.79² =
  15. 15.69² =
  16. 16.89² =
  17. 17.19² =
  18. 18.29² =
  19. 19.81² =
  20. 20.69² =
  21. 21.89² =
  22. 22.29² =
  23. 23.79² =
  24. 24.51² =
  25. 25.49² =
  26. 26.29² =
  27. 27.29² =
  28. 28.69² =
  29. 29.89² =
  30. 30.69² =
  31. 31.29² =
  32. 32.21² =
  33. 33.49² =
  34. 34.89² =
  35. 35.91² =
  36. 36.89² =
  37. 37.79² =
  38. 38.89² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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