Math
posted by Vernon
What is the best way to use mental math to multiply (5x18)x20?

Reiny
well, 5 x 20 = 100
and 100 x 18 = 1800
Respond to this Question
Similar Questions

math
Using the breaking apart method, what is the best way to multiply 8 by 7? 
3rd grade math
How can you use mental math to multiply 800 x 5? 
math mental math help
i need to use mental math and the distributive property to simplify: can you pls check if this correct? 
math help
i need to use mental math and the distributive property to simplify: can you pls check if this correct? 
math
multiply using mental math 25*400= 
math mental math
shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks? 
Algebra
Explain how to use mental math to simplify the expression. a.) 8 * 3 * 2 b.) 8 * 2 + 3 c.) 5 + 8 + 3 d.) 10 * 3 4 I have to explain the process. Example: Using the associative property of multiplication I can group 8*(3*2) so I get … 
History
Reference Maps and Thematic Maps vary across the globe. Which of the following is the correct answer? 
Math
Using the break apart method what is the best way to multiply 8x7 
Math  Help! ASAP
8. a) Estimate 51% of 162. First, we can multiply. So, 162 x 51% = 82.62. We round it, which will be 83. b) Use mental math to calculate 51% of 162. If we round 51%, it is close to 50%. So, in that case, 50% of 162 is 81. Did I do …