← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 531 · 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. 2.59² =
  3. 3.31² =
  4. 4.61² =
  5. 5.91² =
  6. 6.39² =
  7. 7.41² =
  8. 8.91² =
  9. 9.81² =
  10. 10.19² =
  11. 11.89² =
  12. 12.19² =
  13. 13.79² =
  14. 14.31² =
  15. 15.19² =
  16. 16.29² =
  17. 17.89² =
  18. 18.81² =
  19. 19.89² =
  20. 20.19² =
  21. 21.69² =
  22. 22.91² =
  23. 23.61² =
  24. 24.19² =
  25. 25.41² =
  26. 26.79² =
  27. 27.71² =
  28. 28.51² =
  29. 29.39² =
  30. 30.91² =
  31. 31.51² =
  32. 32.41² =
  33. 33.91² =
  34. 34.81² =
  35. 35.91² =
  36. 36.51² =
  37. 37.91² =
  38. 38.21² =
  39. 39.21² =
  40. 40.59² =

Answer key

  1. 7921
  2. 3481
  3. 961
  4. 3721
  5. 8281
  6. 1521
  7. 1681
  8. 8281
  9. 6561
  10. 361
  11. 7921
  12. 361
  13. 6241
  14. 961
  15. 361
  16. 841
  17. 7921
  18. 6561
  19. 7921
  20. 361
  21. 4761
  22. 8281
  23. 3721
  24. 361
  25. 1681
  26. 6241
  27. 5041
  28. 2601
  29. 1521
  30. 8281
  31. 2601
  32. 1681
  33. 8281
  34. 6561
  35. 8281
  36. 2601
  37. 8281
  38. 441
  39. 441
  40. 3481

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