90 x 70 = 6300
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The GCF is 4.
Estimating the product of 68 and 21 . . . It is easy in your head to think that this product would be close to 70 times 20. Again, in your head, you can figure that product to be 1400.
The GCF is 4.
Oh, dude, you're hitting me with the big math questions, huh? Well, technically speaking, the estimate for 92 would be around 90 or 95, depending on which side you want to round to. But hey, who's really keeping track, right? Just go with whatever feels right in the moment, like, it's all good.
If that's 526 and 892, the GCF is 2. If that's 52, 68 and 92, the GCF is 4.