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Estimate the product first. Solve by using the standard algorithm. Use your estimate to check the reasonableness of the product.
a. 312 x 149 = _____
b. 743 x 295 = _____
c. 428 x 637 = _____
d. 691 x 305 = _____
e. 4,208 x 606 = _____
f. 3,068 x 523 = _____
g. 430 x 3,064 = _____
h. 3,007 x 502 = _____
i. 254 x 6,104 = _____
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