or
Newton Lake was originally blue because it only had 148 algae plants. Then towns and farms cropped up by the lake. This caused 848 more algae plants to grow, which turned the lake green. About how many algae plants are now in Newton Lake? Choose the better estimate.
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Skill IconEstimate sums: up to six digits
Skill IconEstimate differences: up to six digits
Skill IconD.2Estimate sums: word problems
Skill IconE.2Estimate differences: word problems