Three tools for building number-sense without anyone watching. Slide a number to see all its forms. Estimate before you calculate. Find the pattern.
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Drag the handle along the line. Watch the fraction, decimal, and percent change together. Same number, three faces.
Read the problem. Type your estimate. Then we tell you the actual answer. Builders estimate before they trust a calculator.
Three numbers in a row. What comes next? Type your guess. Then say the rule out loud (or in your head). The rule is the real answer.