TY  - BOOK
AU  - Midthun,Joseph
AU  - Hiti,Samuel
TI  - Subtraction
T2  - Building blocks of math
SN  - 9780716644538
U1  - 510 
PY  - 2022///]
CY  - Chicago, Illinois
PB  - World Book
KW  - Mathematics
KW  - Comic Books, strips, etc
KW  - Juvenile literature
KW  - Subtraction
N1  - "Includes online access to activities."--Cover; Includes index; What is subtraction?; Counting back; Number lines; Checking you work; Losing your marbles; An unknown change; Training your self to substract; Subtraction and addition; Timeline; Who's who : Ada Lovelace; Activity : make your own abacus; Can you believe it?; Subtraction facts
ER  -