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Prices of goods on invoices. Close up view. Loopable stop motion.
Prices of goods on invoices - on black background. Loopable stop motion.
1970s: Arrow arches from zero to eight on number line. Dolls, butterflies and pencils sit on table. Arrow arches from zero to six, seven and eight on number line.
1960s: Boy at a desk listens. Two open paint cans turn into measure glasses with paint. One has ⅓ and the other ½. One now has 56 and other empty. Problem "½ + ⅓" Boy writes 56. Boy listens.
1960s: Ratio of fraction displayed as parts of a circle, fractions added. A number of rectangles with their ratio below. Ratio appears, and equal ratio is placed beside.
United States CIRCA 1960s: Equation x+y=26. Ordered sets of numbers in parentheses. Equation 12+2=y.
1960s: Two measurements, inches changed to feet. Ratio calculated between to measurements. Father lifting his baby in the air, sits baby on his chest. Two fractions.

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1960s: Fraction with unknown value being cross multiplied and solved. Paper with length and width measurements.

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