Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 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.
| Screenshot | Name / Description | Flag? | Rating |
|---|---|---|---|
|
Math Pac Man Answer the addition and subtraction problems and then eat the ghost with the correct answer. |
 |
|
|
Ghost Blasters Race with another player to add two numbers and blast ghosts |
|
|
|
Number Twins Select the number twins that add up to 10. |
|
|
|
Math Mountain Climb the mountain by getting math problems correct. |
|
|
|
Timed Test Timed practice answering equations |
|
|
|
Fribbit Addition Eat the right answer to feed Fribbit |
|
|
|
Fribbit Subtraction Eat the right answer to feed Fribbit - use subtraction |
|
|
|
Bumble Numbers Guide the bee to drop numbers into the correct flower for points |
|
|
|
Part Part Whole Shoot missles at numbers that make up to desired sum. |
|
|
