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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 780 · 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. 1.89² =
  2. 2.39² =
  3. 3.19² =
  4. 4.71² =
  5. 5.29² =
  6. 6.69² =
  7. 7.19² =
  8. 8.21² =
  9. 9.89² =
  10. 10.21² =
  11. 11.61² =
  12. 12.61² =
  13. 13.71² =
  14. 14.21² =
  15. 15.41² =
  16. 16.29² =
  17. 17.19² =
  18. 18.61² =
  19. 19.31² =
  20. 20.89² =
  21. 21.39² =
  22. 22.19² =
  23. 23.71² =
  24. 24.21² =
  25. 25.41² =
  26. 26.71² =
  27. 27.39² =
  28. 28.39² =
  29. 29.79² =
  30. 30.89² =
  31. 31.91² =
  32. 32.49² =
  33. 33.61² =
  34. 34.71² =
  35. 35.29² =
  36. 36.51² =
  37. 37.49² =
  38. 38.41² =
  39. 39.89² =
  40. 40.71² =

Answer key

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

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