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Write an apostrophe ( ' ) in the cell, before the number.
A word equation is where you describe a reaction using the chemicals by their names Eg. Hydrogen+Oxygen>Water A formula/symbol equation is where you use each chemical's formula (which is a group of the elements it consists of) Eg. H2+O2>H2O (you should use small letters for the numbers after the element)
Oh, dude, drawing a flowchart for the sum of even numbers between 0 and 20 is like making a sandwich - you just gotta follow the steps. Start with a box labeled "Start" and draw arrows to boxes for each even number from 0 to 20. Connect those boxes to a box labeled "Sum" and voila, you've got yourself a flowchart for adding up those even numbers. It's as easy as eating pie... mmm, pie.
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The associative property means that in a sum (for example), (1 + 2) + 3 = 1 + (2 + 3). In other words, you can add on the left first, or on the right first, and get the same result. Similar for multiplication. How you use this in an equation depends on the equation.