Number and Operations in Base Ten

Understand place value.
1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
a. 10 can be thought of as a bundle of ten ones — called a “ten.
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
c. 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).
Tasks
1.NBT Task 1a
1.NBT Task 1b
1.NBT Task 1c
1.NBT Task 1d
1.NBT Task 1e
1.NBT Task 1f
1.NBT Task 1g
1.NBT Task 1h
1.NBT Task 1m
1.NBT Task 1n

1.NBT.3 Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.
Tasks
1.NBT Task 2a; 1.NBT 2a BLM
1.NBT Task 2b; 1.NBT 2b Student Form