three hundred and forty years
3 x 100 = 300
4 x 10 = 40
300 + 40 = 340
No two centuries is 200 years; two decades is 20 years.
309 years is longer. 3 centuries = 300 years.
A decade is ten years. So, four decades is forty years.
From 2017, it was 1977.
300
340 years
30 decades
374 years Century = 100 Decade = 10
there are 10 decades in one century so therefore 10 times 4 is 40
400/10 = 40
1958
seven centuries 78 decades
53 decades Yup. A decade is ten years. A century is 100 years. 5 centuries are 500 years so 500 divided by 10 is 50. Add the three other decades and you get 53.
70 decades are in 7 centuries. It's just 10 decades per century times 7 centuries (700 years).
There are 20 decades in two centuries There is 200 years in two centuries and 10 years in a decade. 10 years x 20 decades = 200 years or two centuries
A decade is 10 years and so 40 times 10 = 400 years which is 4 centuries
70 decades