MTE 280
Elementary Math

Composite Numbers

Prime numbers

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Adding inverse: KCC or Keep Change ChangeImages

Same sign gives you a positive answerDifferent sign gives you a negative answerImages

*Do not teach to solve using improper fractions*Top number is how many pieces we haveBottom number is the size of the piecesShowing Fractions

Less than symbol looks like an L <Greater than symbol >Reasoning for comparing fractions:same denominatornumerator the same so went with (bigger/ smaller) piecesanchor fractions ( bigger/ smaller than half)Bigger or smaller pieces (number) away Image

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*Do not say cancel out* say "funky 1" insteadImage

Decimals are fractionsDo not say line up your decimals, Say line up your whole numbers. 1.0 Ones0.1 Tenths0.01 Hundreths0.001 ThousandthsImage

PEMDAS can be confusingUse this instead:GroupingExponentsM/D Divide or Multiply (Left to Right)S/A Add or Subtract (Left to Right)ImageImage

Combining numbers

Finding a difference

Multiplying two numbers is finding the area all the time.

Reinforces prior understandingIs repeatableIs efficient enoughImage

Reinforces prior understandingIs repeatableIs efficient-ishImage

Reinforces prior understandingIs repeatableIs efficient enoughImage

Reinforces prior understandingIs repeatableIs efficientImage

15/515 into 5 groups is 3Finding out how many things are inside a groupTraditional is long division

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Base 10 blocksFlats are hundredsLongs are tensunits are ones