
1 Expert Answer

Mike D. answered 04/30/21
Effective, patient, empathic, math and science tutor
Use long multiplication ?
Alternatively break up the numbers
(798000 + 654) x (9000000 + 807000 + 243)
Multiply this out just using the non zero digits, write the answers down and add manually
eg for (798000 x 9000000) you do 798 x 9 = 7182 on the calculator and add 9 zeroes
so you get
7182000000000
643986000000
193914000
5886000000
527778000
158922
and add these manually
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Mark M.
Have you tried long multiplication? A calculator?04/30/21