← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 308 · 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. 1.79² =
  2. 2.39² =
  3. 3.49² =
  4. 4.69² =
  5. 5.19² =
  6. 6.79² =
  7. 7.41² =
  8. 8.79² =
  9. 9.59² =
  10. 10.39² =
  11. 11.81² =
  12. 12.39² =
  13. 13.31² =
  14. 14.21² =
  15. 15.81² =
  16. 16.41² =
  17. 17.81² =
  18. 18.91² =
  19. 19.29² =
  20. 20.21² =
  21. 21.89² =
  22. 22.41² =
  23. 23.81² =
  24. 24.29² =
  25. 25.19² =
  26. 26.49² =
  27. 27.61² =
  28. 28.39² =
  29. 29.59² =
  30. 30.91² =
  31. 31.59² =
  32. 32.79² =
  33. 33.51² =
  34. 34.79² =
  35. 35.59² =
  36. 36.71² =
  37. 37.61² =
  38. 38.51² =
  39. 39.21² =
  40. 40.41² =

Answer key

  1. 6241
  2. 1521
  3. 2401
  4. 4761
  5. 361
  6. 6241
  7. 1681
  8. 6241
  9. 3481
  10. 1521
  11. 6561
  12. 1521
  13. 961
  14. 441
  15. 6561
  16. 1681
  17. 6561
  18. 8281
  19. 841
  20. 441
  21. 7921
  22. 1681
  23. 6561
  24. 841
  25. 361
  26. 2401
  27. 3721
  28. 1521
  29. 3481
  30. 8281
  31. 3481
  32. 6241
  33. 2601
  34. 6241
  35. 3481
  36. 5041
  37. 3721
  38. 2601
  39. 441
  40. 1681

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