Grades 11-12 Video Solutions 2025-2025_11-12

Video Transcription

Video Summary

The problem requires identifying the interval in which the value of 88 times 888 falls, for a math competition. The potential ranges are from A to E, with progressively larger values. Instead of calculating it directly, an upper and lower bounding method is suggested. The upper bound is determined by estimating 100 times 888 (resulting in 88,800), which eliminates the largest interval option. The lower bound uses 80 times 800 (equaling 64,000), discarding the smallest intervals. This reasoning narrows the viable range down to choice D, between 8,888 and 88,888.

Keywords

math competition

interval estimation

bounding method

multiplication bounds

range narrowing