Maryland College and Career-Ready Standards
MD.MA.1.NBT. Number and Operations in Base Ten (NBT)
1.NBT.B. Understand Place Value.
1.NBT.B.2. Major Standard: Understand that the two digits of a two-digit number represent amounts of tens and ones.
1.NBT.B.2.4. Ability to count by tens and ones.
1.NBT.B.2c. Major Standard: Understand that the two digits of a two-digit number represent amounts of tens and ones – Understand the following as a special case: The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
1.NBT.B.2c.1. Ability to use base ten manipulatives (e.g., base ten blocks, DigiBlocks, Unifix Cubes, ten frames, interlocking base ten blocks) to build and model counting by tens.
1.NBT.B.2c.2. Ability to skip count by 10s to 100 understanding that each ten counted represents that number of groups of ten.
1.NBT.C. Use place value understanding and properties of operations to add and subtract.
1.NBT.C.5. Major Standard: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
1.NBT.C.5.4. Knowledge of place value and skip counting by forward 10.
1.NBT.C.6. Major Standard: Subtract multiples of 10 in the range of 10-90 from multiples of 10 in the range of 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
1.NBT.C.6.4. Knowledge of place value and skip counting by 10.