Final answer:
Shan spends 630 minutes with his friends in 7 days by multiplying the 90 minutes he sees them each day by 7 days.
Step-by-step explanation:
To calculate how many minutes Shan sees his friends in 7 days, we will use place value and simple multiplication. Shan sees his friends for 90 minutes each day. To find the total minutes spent with friends over 7 days, we multiply the daily minutes by the number of days:
- Multiply the daily time by the number of days: 90 minutes/day × 7 days.
- Using place value, where 90 is 9 tens, we know that 9 tens × 7 equals 63 tens, or 630.
Therefore, Shan spends a total of 630 minutes with his friends in 7 days.