Question

Bagels costs .95 cents, Leticia wants to but 12 bagels.She uses partial products to find her total.She says "$16.80 is close to my estimate of 12×$1= $12,so this total is reasonable" Do you agree with her? Explain your reasoning

12 bagels, .95 each

10 × 0.5 = 5
10 × 0.9 = 9
2 × 0.5 = 1
2 × 0.9 = 1.8

$5 + $9 + $1 + $1.80 = $16.80

Answer 1

No. Her reasoning was

10 × 0.5 = 5
10 × 0.9 = 9
2 × 0.5 = 1
2 × 0.9 = 1.8

but it should have been
10 × 0.05 = 0.5
10 × 0.9 = 9
2 × 0.05 = 0.1
2 × 0.9 = 1.8

to end up with $11.40

The 0.5 is in the wrong decimal place, it should be 0.05