This, as counting, 10 20 30 40 50 60 70 80 90 100, is the same as 10x1 10x2 10x3 10x4 10x5 10x6 10x7 10x8 10x9 10x10. It helps you know all the numbers multiplied and divided by 10.
By counting by 2s
You add two zeros at the end of the answer 80*90=7200
simple. just multiply 192,000 by 10=1,920,000 tens
It refers to ten. The decimal system is based on counting in tens.
Pre-historic humanoids who discovered that they had 10 digits on their hands.
by counting by tens
By counting by 2s
10,20,30,40,50,60,70 (keep counting by tens)
You multiply by 10.
It refers to counting in units and tens, multiples of tens (such as hundreds, thousands and so on), and fractions of tens (such as tenths, hundredths and so on).
You add two zeros at the end of the answer 80*90=7200
It refers to ten. The decimal system is based on counting in tens.
Pre-historic humanoids who discovered that they had 10 digits on their hands.
simple. just multiply 192,000 by 10=1,920,000 tens
Multiply them together, then multiply that total by successive counting numbers.
That means multiply it by 2. If your tens digit is 3, your ones digit is 6.
dauddeg saith (decimal system, i.e. counting by tens)orsaith ar hugain (vigesimal system, i.e. counting by twenties)