9. Here is Marco's method for calculating 38 X 60: boislene 4 times 6 is 24, so 40 times 60 is 2400. Then qinlend 2 times 6 is 12, so it's 2400 – 120, which is 2280. - Write equations that incorporate Marco's method and that also show why his method is valid. Write your equations in the following form: 38 X 60 = some expression = some expression rewrite = 2280 ori Which properties of arithmetic did Marco use (knowingly or not), and where? wod
9. Here is Marco's method for calculating 38 X 60: boislene 4 times 6 is 24, so 40 times 60 is 2400. Then qinlend 2 times 6 is 12, so it's 2400 – 120, which is 2280. - Write equations that incorporate Marco's method and that also show why his method is valid. Write your equations in the following form: 38 X 60 = some expression = some expression rewrite = 2280 ori Which properties of arithmetic did Marco use (knowingly or not), and where? wod
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:**Marco's Method for Calculating 38 × 60**
Marco's method involves breaking down the multiplication of 38 by 60 using the following steps:
1. **Break Down:**
- Calculate \(4 \times 6 = 24\), so \(40 \times 60 = 2400\).
- Calculate \(2 \times 6 = 12\), so subtract from 2400: \(2400 - 120 = 2280\).
2. **Write Equations:**
- Write equations to show Marco's method and its validity.
- Use the following form:
- \(38 \times 60 = \text{some expression}\)
- \(= \text{some expression}\)
- \(... \)
- \(= 2280\)
3. **Discuss Properties of Arithmetic:**
- Identify which arithmetic properties Marco used (knowingly or unknowingly) and where he applied them.
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