Last Lesson (Number x Value Method)

Today will be the last lesson and today's topics is the easiest of all, it is called the Number x Value Method. Unlike the Guess and Check method, the Number x Value method is used when relationships are involved in the question. People use this method to get the answer more efficiently by multiplying the number of units of each item with value of each item.

Question 1:

There are some 10cent and 20 cent coins in a box. There are thrice as many 10 cents coins as 20 cents coins. If the total amount of money in the box is $18, how many coins are there together?

Solution 1 :

Value (cents) --> 10 Number of units--> 3

Value (cents) --> 20 Number of units --> 1

Total amount:

3 x 10 =30
1 x 20 = 20

Total: 50units

Hence,
50units--> 18 x 1000= 1800
1unit--> 1800 divide 50 = 36
4units --> 4 x 36 = 144#


Question of the day:

A goldfish costs $12. An angelfish costs $3 less. Mr Ho paid $195 for some goldfish and angelfish. he bought thrice as many angelfish as goldfish.
a) How many fish did he buy altogether?
b) How much more did he spend on goldfish than angelfish?


Answer: a)20 b) $15

This is the end and there will be a small test two weeks later, please prepare well.