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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 458 · 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. 1.61² =
  2. 2.69² =
  3. 3.19² =
  4. 4.91² =
  5. 5.41² =
  6. 6.61² =
  7. 7.81² =
  8. 8.71² =
  9. 9.31² =
  10. 10.71² =
  11. 11.91² =
  12. 12.51² =
  13. 13.39² =
  14. 14.41² =
  15. 15.71² =
  16. 16.31² =
  17. 17.39² =
  18. 18.19² =
  19. 19.21² =
  20. 20.89² =
  21. 21.91² =
  22. 22.19² =
  23. 23.91² =
  24. 24.89² =
  25. 25.21² =
  26. 26.59² =
  27. 27.39² =
  28. 28.61² =
  29. 29.39² =
  30. 30.71² =
  31. 31.89² =
  32. 32.49² =
  33. 33.69² =
  34. 34.71² =
  35. 35.79² =
  36. 36.69² =
  37. 37.49² =
  38. 38.81² =
  39. 39.89² =
  40. 40.71² =

Answer key

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

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