- A81
- B361
- C100
- D190
Step-by-Step Solution
Adding the first n odd numbers builds an n by n square. From 1 to 19 there are 10 odd numbers, so the sum is . (81 uses 9 bands; 361 is )
Answer: C) 100
The 5 by 5 square is built from coloured L-shaped bands of 1, 3, 5, 7 and 9 tiles. Using the same idea, what is 1 + 3 + 5 + … + 19?
Class 6Patterns in Whole NumbersWhole Numbers
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Patterns in Whole Numbers practice questions
More Class 6 Patterns in Whole Numbers practice
Look at the pattern on the cards. What number should replace ? on the last card?The staircase goes up 1, 2, 3, 4 blocks and back down 3, 2, 1, using 16 blocks in all.…Blue bars of heights 1, 2, 3, 4, 5, 6 and the same bars turned upside down (yellow) fit…6 dots can be arranged as a triangle and also as a rectangle with at least 2 rows and 2…The L-shapes grow by the same rule from one figure to the next. How many squares will…