How does mark know this number sentence is true?
4 × 9 = (4 × 5) + (4 × 4)
he knows tha...
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Mathematics, 18.09.2019 00:00 19thomasar
How does mark know this number sentence is true?
4 × 9 = (4 × 5) + (4 × 4)
he knows that 4 × 9 = 4 × 3 + 4 × 3.
he knows that 9 can be broken into 5 + 4.
he knows that 9 is not a prime number.
a grid with four rows and nine columns. a heavy vertical line separates the fifth and sixth columns.
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