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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 598 · 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. 2.71² =
  3. 3.79² =
  4. 4.41² =
  5. 5.79² =
  6. 6.89² =
  7. 7.19² =
  8. 8.89² =
  9. 9.49² =
  10. 10.41² =
  11. 11.79² =
  12. 12.59² =
  13. 13.21² =
  14. 14.61² =
  15. 15.91² =
  16. 16.51² =
  17. 17.79² =
  18. 18.19² =
  19. 19.41² =
  20. 20.91² =
  21. 21.59² =
  22. 22.31² =
  23. 23.89² =
  24. 24.41² =
  25. 25.19² =
  26. 26.91² =
  27. 27.51² =
  28. 28.39² =
  29. 29.69² =
  30. 30.69² =
  31. 31.69² =
  32. 32.49² =
  33. 33.21² =
  34. 34.71² =
  35. 35.41² =
  36. 36.59² =
  37. 37.69² =
  38. 38.61² =
  39. 39.69² =
  40. 40.19² =

Answer key

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

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