By rounding to 1 significant figure, estimate the answers to these questions: a) 92x98 b)49x138 c)216x876

Sure, here are the estimates for the given problems by rounding to 1 significant figure:

a) 92x98 First, round 92 and 98 to the nearest tens, which gives you 90 and 100 respectively. Then multiply these two numbers together. 90 x 100 = 9000

b) 49x138 First, round 49 and 138 to the nearest tens, which gives you 50 and 140 respectively. Then multiply these two numbers together. 50 x 140 = 7000

c) 216x876 First, round 216 and 876 to the nearest hundreds, which gives you 200 and 900 respectively. Then multiply these two numbers together. 200 x 900 = 180000

So, the estimated answers to the problems are: a) 9000 b) 7000 c) 180000