SCIENTIFIC NOTATION { ADDING, SUBTRACTING, MULTIPLY AND DIVIDE)
http://www.xpmath.com/forums/arcade.php?do=play&gameid=20
https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-numbers-operations/cc-8th-scientific-notation-compu/e/adding-and-subtracting-in-scientific-notation
http://www.proprofs.com/quiz-school/quizshow.php?title=scientific-notation-multiplication-division-addition-subtraction&q=1
https://www.khanacademy.org/math/pre-algebra/exponents-radicals/computing-scientific-notation/e/multiplying_and_dividing_scientific_notation
http://www.aaamath.com/g71n_mx1.htm
http://www.xpmath.com/forums/arcade.php?do=play&gameid=21
https://janus.astro.umd.edu/cgi-bin/astro/scinote.pl
https://www.quia.com/quiz/358716.html?AP_rand=1679522205 -> quiz
http://www.xpmath.com/forums/arcade.php?do=play&gameid=20
https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-numbers-operations/cc-8th-scientific-notation-compu/e/adding-and-subtracting-in-scientific-notation
http://www.proprofs.com/quiz-school/quizshow.php?title=scientific-notation-multiplication-division-addition-subtraction&q=1
https://www.khanacademy.org/math/pre-algebra/exponents-radicals/computing-scientific-notation/e/multiplying_and_dividing_scientific_notation
http://www.aaamath.com/g71n_mx1.htm
http://www.xpmath.com/forums/arcade.php?do=play&gameid=21
https://janus.astro.umd.edu/cgi-bin/astro/scinote.pl
https://www.quia.com/quiz/358716.html?AP_rand=1679522205 -> quiz