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MathCast 3 was multiplying two-digit by two-digit numbers using four partial products. This most closely relates to Chapter 4 Section 4, where we learn about the popular FOIL method, and breaking an area model into partial products. By taking the areas of the new partial product pieces of the area model, you can add them together to find the total area of the model (Sybilla Beckmann).

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MathCast 2 was on subtracting from 200 and from numbers with zeroes in the 10s place. This most closely relates to Chapter 3 Section 3. Using the structure of the Base 10 system, we can unbundle or groups of 100s into 10s and 10s into 1s. It incorporates the typical “borrow” or better understood as “take” method in the standard algorithm, where we take from a place value to make 0 into a number we can subtract from (Sybilla Beckmann).

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MathCast 1 was on how to write and interpret two digit numbers up to 100 as addition sentences that combine 10s and 1s. This most closely relates to Chapter 1 Section 1 where the Base 10 system is introduced, showing how we can take any two digit number and break them into 10s and 1s. Chapter 1 Section 1 also shows how each place value is set in Base 10, so a number in the tens place is a bundle of 10, and a number in the ones place is a single unit (Sybilla Beckmann).

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