Page 178 - SK Year 5 Mathematics DLP

5
1.15 centuries old

The total age of the two antique vases shown in the picture above is
318 years. What is the age, in centuries and years, of the blue and
white antique vase?

Solution

I use the working backward method.

+ 1.15 centuries = 318 years

Convert 1.15 centuries to years.
1.15 centuries = (1.15 × 100) years
= 115 years

5 years 10 years 100 years 115 years

208 218 years 318 years
years
203 years
203 years = 200 years + 3 years
= 2 centuries 3 years

I check using this method.

3 18 years 203 years = 200 years + 3 years
− 1 15 years = (200 ÷ 100) centuries + 3 years
203 years = 2 centuries 3 years

2 centuries 3 years + 1.15 centuries = 318 years

The blue and white antique vase is 2 centuries 3 years old.

170 • Discuss various problem-solving strategies such as making tables
4.4.1
and simulations.