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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 76 · 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. 1.21² =
  2. 2.39² =
  3. 3.51² =
  4. 4.79² =
  5. 5.61² =
  6. 6.79² =
  7. 7.69² =
  8. 8.49² =
  9. 9.69² =
  10. 10.29² =
  11. 11.41² =
  12. 12.69² =
  13. 13.91² =
  14. 14.21² =
  15. 15.29² =
  16. 16.81² =
  17. 17.19² =
  18. 18.31² =
  19. 19.49² =
  20. 20.21² =
  21. 21.61² =
  22. 22.79² =
  23. 23.31² =
  24. 24.89² =
  25. 25.71² =
  26. 26.91² =
  27. 27.79² =
  28. 28.21² =
  29. 29.31² =
  30. 30.61² =
  31. 31.71² =
  32. 32.51² =
  33. 33.71² =
  34. 34.71² =
  35. 35.71² =
  36. 36.91² =
  37. 37.31² =
  38. 38.81² =
  39. 39.61² =
  40. 40.29² =

Answer key

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

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