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Subtraction and Division Strategies
Handle: Document-5268
Owner: Geveshausen, Olivia (User-6386, 15414:EVERETT)DS
Wednesday, February 9, 2005 03:33:07 PM PST
Thursday, November 18, 2021 12:47:59 PM PST
Modified By: Diaz, Ailienette (User-392, 08810:EVERETT)DS
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  • Subtraction and Division – Mental Math or Algorithm Examples
Division:• Subtracting groups of the divisor159 ÷ 13 159 29 OR Use the Big 7 method of recording10 x 13 = 130 -130 -262 x 13 = 26 29 312 r3• Breaking the problem into parts150 ÷ 48 = (50 ÷ 48) + (50 ÷ 48) + (50 ÷ 48) = 3 r 6(There is one 48 with 2 left over in each 50)OR159/13Break into 130 + 29, 130 divided by 13 is 10; 29 divided by 13 is 2 with 3 remaining • Transferring the problem into an equivalent problem that is easier to solve.
  • So there are only 19 thirteens in
247)• Dealing out into groups159/13Give 10 to each group; that ...
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