The number 9.210 is greater. The least place value is the 0 (Zero) and the 1 (One). This is because the 9 (Nine) and the 2 (Two) in 9.207 and 9.210 is the same numbers. There so, you can't compare those 2 (Two) numbers.
find the least common multiple of 25 and 30, which is 150
so they will flash at the same time every 150 seconds which equals 2.5 minutes
The addition property of equality
Round 34 to 30 and round 89 to 90. Multiply 30 and 90 which equals to 2700.
