Nika baked three loaves of zucchini bread. Each loaf needed 17 fourths cups of flour. Which expression shows the best estimate of the number of cups of flour that Nika used?

Each loaf uses 17/4 cups, which is 4 1/4 cups—about 4 cups. For three loaves, estimate 4 + 4 + 4 = 12 cups. So the best estimate is “4 plus 4 plus 4 is equal to 12.”

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