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Boy doing math problems in classroom
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Boy doing math problems in classroom

Mixed race teacher doing math on chalkboard
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Mixed race teacher doing math on chalkboard

Boys solving math problems on blackboard
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Boys solving math problems on blackboard

Mixed race children having burgers in restaurant
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Mixed race children having burgers in restaurant

Black boy solving math problems on blackboard
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Black boy solving math problems on blackboard

Asian man putting logs in fireplace
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Asian man putting logs in fireplace

Chinese grandfather teaching abacus to grandson
TTM22B21_146

Chinese grandfather teaching abacus to grandson

Mixed race boy using flash cards to study math
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Mixed race boy using flash cards to study math

Pacific Islander teacher holding sticky note with math problem
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Pacific Islander teacher holding sticky note with ...

African girl holding addition flash cards
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African girl holding addition flash cards

Mixed race girl doing math on blackboard
TTM22B92_429

Mixed race girl doing math on blackboard

Mixed race student working in chemistry lab
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Mixed race student working in chemistry lab

Mixed race student working in chemistry lab
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Mixed race student working in chemistry lab

Close up of plus and minus toy blocks with money
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Close up of plus and minus toy blocks with money

Boy (6-7) holding math card
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Boy (6-7) holding math card

Mathematical symbols on chalkboard
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Mathematical symbols on chalkboard

Result of simple addition displayed on tablet
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Result of simple addition displayed on tablet

Young woman examining broke cigarette. 
Photo : Jessica Peterson
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Young woman examining broke cigarette. Photo : J...

Coins by rolled up receipts with prices.
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Coins by rolled up receipts with prices.

Rolled up receipts with prices.
TTM11A01_417

Rolled up receipts with prices.

Scale model house. Photo : David Arky
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Scale model house. Photo : David Arky

Calculator and receipts
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Calculator and receipts

Calculator and receipts
TTM10A01_070

Calculator and receipts

Receipts
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Receipts

Student in front of chalkboard
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Student in front of chalkboard

Student in classroom
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Student in classroom

Student in front of chalkboard
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Student in front of chalkboard

Student in front of chalkboard
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Student in front of chalkboard

Abacus.
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Abacus.

Abacus.
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Abacus.

Abacus.
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Abacus.

Abacus.
TTM09A15_422

Abacus.

A chalkboard with mathematic symbols on it
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A chalkboard with mathematic symbols on it

Boy doing math on blackboard.
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Boy doing math on blackboard.

Man reviewing house blueprints. Date : 2008
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Man reviewing house blueprints. Date : 2008

Man reviewing house blueprints. Date : 2008
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Man reviewing house blueprints. Date : 2008

Couple reviewing house blueprints. Date : 2008
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Couple reviewing house blueprints. Date : 2008

Couple reviewing house blueprints. Date : 2008
TTM08A16_424

Couple reviewing house blueprints. Date : 2008

Woman checking financial page with calculator.
TTM08A03_025

Woman checking financial page with calculator.

Still life of cash register.
TTM08A01_881

Still life of cash register.

Closeup of a wooden abacus.
TTM08A02_082

Closeup of a wooden abacus.

Woman using a calculator.
TTM08A03_026

Woman using a calculator.

Still life of cash register.
TTM08A01_874

Still life of cash register.

Cash register with money.
TTM08A01_882

Cash register with money.

Still life of tax forms, pencil, calculator.
TTM08A02_753

Still life of tax forms, pencil, calculator.

Woman using a calculator.
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Woman using a calculator.

Still life of calculator.
TTM08A02_694

Still life of calculator.

Closeup of a calculator.
TTM08A02_982

Closeup of a calculator.

Still life of a calculator.
TTM08A02_237

Still life of a calculator.

Closeup of sales receipt.
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Closeup of sales receipt.

Mother using calculator with baby in seat on table. Date : 2006
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Mother using calculator with baby in seat on table...

Closeup of sales receipt.
TTM08A01_423

Closeup of sales receipt.

Woman working against tax deadline.
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Woman working against tax deadline.

Closeup of a calculator.
TTM08A02_981

Closeup of a calculator.

Closeup of a wooden abacus.
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Closeup of a wooden abacus.

Girl writing on blackboard and smiling. Date : 2006
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Girl writing on blackboard and smiling. Date : 200...

Closeup of sales receipt.
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Closeup of sales receipt.

Pile of four stones.
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Pile of four stones.