Tiaki is fixing part of his fence. The pickets he needs are .68m long each. How many metres of timber does he need to cut up 45 pickets?
28.2m
.68 x ___ = 45
.68 x 10 = 6.8
.68 x 20 = 6.8 x 2 = 12.4
.68 x 40 = 12.4 x 2 = 24.8
.68 x 5 = 6.8 divided by 2 = 3.4
3.4 + 24.8 = 28.2m
If the timber comes in 5m lengths only what is the minimum amount of lengths he needs to have enough for 45 pickets?
6
5 x 6 = 30, (more than 28.2)
6 x 5m lengths
30m
The timber is $3.55/m. How much will he have spent?
$106.5
30 x $3.55 = ___
30 x 3 = 90
30 x .50 = 15
30 x .05 = 1.5
90 + 15 + 1.5 = 106.5
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