ARM 10.53.503. MONTANA GRADE 1 MATHEMATICS CONTENT STANDARDS

(1) Mathematics operations and algebraic thinking content standards for Grade 1 are to: (a) use addition and subtraction within 20 to solve problems of all types. This standard should incorporate cultural context relating to Montana Indigenous Peoples and local communities; (b) solve problems in context, that call for addition of three whole numbers with a sum less than or equal to 20 in context of all types. This standard should incorporate cultural context relating to Montana Indigenous Peoples and local communities; (c) flexibly compose and decompose numbers to add and subtract; (d) understand subtraction as an unknown-addend problem; (e) relate counting to addition and subtraction; (f) flexibly, accurately, and efficiently add and subtract within 10; (g) use multiple strategies to add and subtract within 20; (h) understand the meaning of the equal sign and determine if equations are true or false; and (i) determine the unknown number in an addition or subtraction equation relating to three numbers. (2) Mathematics number and operations in base ten content standards for Grade 1 are to: (a) flexibly count, read, write, and represent numbers to 120; (b) understand that ten is a unit composed of ten ones and that a two-digit number represents tens and ones; (c) compare two two-digit numbers using comparison symbols >, =, and <; (d) build a foundation for addition within 100 by: (i) adding two-digit to one-digit numbers; and (ii) adding multiples of 10 to two-digit numbers; (e) using place value, given a two-digit number, find 10 more or 10 less than the number; and (f) subtract multiples of 10 from a two-digit number. (3) Mathematics measurement and data content standards for Grade 1 are to: (a) order three objects by length and compare the lengths of two objects indirectly by using a third object. This standard should incorporate cultural context relating to Montana Indigenous Peoples and local communities; (b) express the length of an object as a whole number of length units; understand that the measurement of an object is the number of same-size length units that span it with no gaps or overlaps; (c) tell and write time in hours and half-hours using analog and digital clocks; (d) identify the value of coins; and (e) organize, represent, and interpret data with up to three categories by: (i) asking and answering questions about the total number of data points; (ii) identifying how many are in each category; and (iii) analyzing differences between categories. (4) Mathematics geometry content standards for Grade 1 are to: (a) distinguish between defining attributes versus nondefining attributes; (b) build and draw shapes to possess defining attributes; (c) compose new shapes using two- and three-dimensional shapes; and (d) partition circles and rectangles into two and four equal shares; describe the shares using the words: halves, fourths, and quarters.