Mathematics, 10.07.2019 16:10 montgomerykarloxc24x
Use mental calculations -- compatible numbers, substitutions, equal products, or equal quotients -- to compute exact answers.
show all steps. indicate which method you are using.
1) 90 / 18
2) 15 x 104
3) 35 x 60
4) 5 x 18 x 4 x 10
5) 82 - 29
Answers: 2
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