Greater. lesser, and Equal....Maths symbols

1. https://www.mathsisfun.com/equal-less-greater.html

=	When two values are equal we use the "equals" sign	example: 2+2 = 4
≠	When two values are definitely not equal we use the "not equal to" sign	example: 2+2 ≠ 9
<	When one value is smaller than another we use a "less than" sign	example: 3 < 5
>	When one value is bigger than another we use a "greater than" sign	example: 9 > 6

1. http://www.enchantedlearning.com/math/symbols/
2. http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/inequalitiesrev1.shtml
3. http://www.math-only-math.com/finding-out-the-numbers.html

1. (a) The smallest 1-digit number is 1. 

1. The greatest 1-digit number is 9. 

1. Therefore, 9 - 1 = 8 and 8 + 1 = 9 

1. So, we say that we have 9 one-digit numbers. 

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1. (b) The smallest 2-digit number =10. 

1. The greatest 2-digit number = 99. 

1. Therefore 99 - 10 = 89 and 89 + 1 = 90 

1. So, we say that we have 90 two-digit numbers. 

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1. (c) The smallest 3-digit number = 100. 

1. The greatest 3-digit number = 999. 

1. There for 999 - 100 = 899 and 899 + 1 = 900 

1. So, we say that we have 900 three-digit numbers. 

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1. (d) The smallest 4-digit number = 1000. 

1. The greatest 4-digit number = 9999. 

1. There for 9999 - 1000 = 8999 and 8999 + 1 = 9000 

1. So, we say that we have 9000 four-digit numbers.