28+31=

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`x`²	`x`^□	log_□	√☐	^□√☐	≤	≥	□□	·	÷	`x`^◦	π
(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

☐²

x^☐

√☐

^□√☐

□□

log_□

θ

∞

∫

ddx

≥	≤	·	÷	`x`^◦	(☐)	\|☐\|	(`f` ◦ `g`)	`f`(`x`)	ln	`e`^☐
(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

simplify solve for inverse tangent line

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long addition 28+31

Solution

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Solution steps

One step at a time

28+31

Line up the numbers

	2	8
+	3	1

Add each column of digits, starting on the right and working left.
If the sum of a column is more than ten, 'carry' digits to the next column on the left.

Add the digits of the bolded column: 8+1=9

	2	8
+	3	1

Add the digits of the bolded column: 2+3=5

	2	8
+	3	1

=59

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Notebook

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−▭▭	<	7	8	9	÷	`AC`
+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

28+31=

Solution

Solution steps

Number Line