Includes index. "Includes online access to activities" -- Cover.
Contents:
What is subtraction? -- Counting back -- Number lines -- Checking your work -- Losing your marbles -- An unknown change -- Training yourself to subtract -- Subtraction and addition -- Timeline -- Who's who: Ada Lovelace -- Activity: Make your own abacus -- Can you believe it?! -- Subtraction facts -- Note to educators.
Summary:
"A graphic nonfiction volume that introduces critical basic subtraction concepts"-- Provided by publisher
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.