additive color color theory color wheel subtractive model wheel add adding-machine addition appearance bulky buttons calculate calculating calculations calculators clear Clearance computers computing digits handle heavy input large limitations limited machine numbers numerals office office-equipment output predating press pressing problem-solving problems slow subtract subtraction technology additive model subtractive arithmetic basic business count digit digital display math minus multiply number plus pocket children division education kindergarden kindy learning mathematics maths multiplication play playing school toy 10 accounting game list point random rate score ten tile 1 2 3 beginning child class clay colour counting elementary grade homework introduction kid kids kindergarten learn lesson modelling numerical order play doh preschool primary schoolwork sequence shape student study subject teach teacher

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140 7 grade account_circle Color Model (Subtractive)
20 0 grade account_circle before calculators1
168 6 grade account_circle Color Model (Additive)
12 0 grade account_circle pocket calculator
175 1 grade account_circle toy numbers
87 4 grade account_circle ten
87 1 grade account_circle numbers
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number of photos found: 7 | number of pages found: 1
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