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course Mth 151
7/19 1
Question: `q query 4.2.6 53812 in expanded form.
What is 53812 in expanded form?
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
Your solution:
2 means 2 * 10^0 1 means 1 * 10^1 8 means 8 * 10^2 3 means 3 * 10^3 5 means 5 * 10^4 Thus the number 53812 means (5*10^4)+(3*10^3)+(8*10^2)+(1*10^1)+(2*10^0).
3
Ok
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Question: `q query 4.2.20 536 + 279 in expanded notation
Write 536 + 279 in expanded notation.
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
Your solution:
We write this sum as
5 * 10^2 + 3 * 10^1 + 6 * 10^0 +
2 * 10^2 + 7 * 10^1 + 9 * 10^0
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8 * 10^2 + 10* 10^1 + 15* 10^0. Since 10 * 10^1 = 10^2 we can write this as
9 * 10^2 + 0 * 10^1 + 15 * 10^0. Since 15 * 10^0 = 10 * 10^0 + 5 * 10^0 = 10^1 + 5 * 10^0 we rewrite this as
9 * 10^2 + 1 * 10^1 + 5 * 10^0. This result is expressed in our place-value system as 915.
3
Ok
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