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Lesson 4: Estimate products

# Estimating with multiplication

Sal estimates to find reasonable products to 1-digit by 2, 3, and 4-digit multiplication expressions.

## Want to join the conversation?

• you should add game to calm down when others need a break like math, reading, grammer enything and it should be fun • Question: How do you know what number is a friendly number or not?

And how do you know when you are supposed to round a single-digit or ten-digit number up or down?

It looks like sometimes when estimating what to round up or down you sometimes have to round both numbers down like 16 to 15 and 1111 to 1000. I have trouble knowing what to round up or down if it's not asking for a friendly number.

This is a similar problem I had when estimating was first introduced in the 3rd-grade segments of Khan Academy. Those questions weren't fully mentioned besides rounding by 10s 100s, and 1000s.  • Why is math so so so easy • What does the squiggly equal sign mean.And why • where are the videos for some of are work? • all learning videos if you don't know them • thnkess gvbf3hf3rkf;rq   