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### Grade 7 - Mathematics5.4 Construct the Formula

example:
Change the minutes into seconds.
No. of Minutes (m)12345678
No. of Seconds (s)60120180240------------
Find the missing numbers in the table and construct the formula.

Solution:
When m = 1, s = 60
m = 2, s = 120
m = 3, s = 180
m = 4, s = 240
We observe a pattern in the values of (m and s) and we get the formula s = m*60.
Using above formula we can find the missing numbers.
When m = 5 Þ s = 5 * 60 = 300
m = 6 Þ s = 6 * 60 = 360
m = 7 Þ s = 7 * 60 = 420
m = 8 Þ s = 8 * 60 = 480

Directions: Construct the formula for the following problems. Also write at least 5 examples of your own.
 Q 1: Change Dollars into Cents.Formula c = 100*D and missing terms are 600, 700 respectively.Formula D = 100*c and missing terms are 600, 700 respectively. Q 2: Supplementary Angles.Formula A-B = 180 degrees and missing terms are 110, 70 respectively.Formula A+B = 180 degrees and missing terms are 110, 70 respectively. Question 3: This question is available to subscribers only! Question 4: This question is available to subscribers only!

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