← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 855 · 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. 1.41² =
  2. 2.59² =
  3. 3.61² =
  4. 4.31² =
  5. 5.31² =
  6. 6.31² =
  7. 7.81² =
  8. 8.81² =
  9. 9.19² =
  10. 10.19² =
  11. 11.59² =
  12. 12.19² =
  13. 13.19² =
  14. 14.41² =
  15. 15.51² =
  16. 16.41² =
  17. 17.19² =
  18. 18.31² =
  19. 19.51² =
  20. 20.91² =
  21. 21.71² =
  22. 22.79² =
  23. 23.39² =
  24. 24.61² =
  25. 25.41² =
  26. 26.79² =
  27. 27.31² =
  28. 28.91² =
  29. 29.41² =
  30. 30.51² =
  31. 31.91² =
  32. 32.59² =
  33. 33.41² =
  34. 34.51² =
  35. 35.31² =
  36. 36.19² =
  37. 37.19² =
  38. 38.71² =
  39. 39.79² =
  40. 40.91² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths