Page 3 - Geometric Patterns
P. 3
7.2 Clever counting
1. (a) How many beads are there in this string? Explain your
method.
(b) Look at these methods that other learners used.
Who is correct? Which method do you think is the best?
Simon points with his finger and counts the beads one by
one: “One, two, three … 28, 29.”
Amir says: “There are five yellows in each group and three
greens. So I count 5, 8, 13, 16, 21, 24, 30, 33.”
Mia says: “There are five yellows in each group and three
greens. So I count the yellows first: 5, 10, 15, 20. Then I
continue to count the greens: 23, 26, 29, 32.”
Thea says: “I group the yellows and greens together like
this and then count in eights: 8, 16, 24, 32.”
2. Use clever counting to easily find the simon counted the
number of beads in each of the four beads one by one.
bracelets below. Explain how you do the other learners
it. Compare your method with some counted bigger units
of your classmates’ methods. like 3 and 5 and 8.
they used clever
counting!
(a)
(b)
