Grade 1 • Mathematics • Number Operations

Grade 1 Mathematics

Number Operations

Addition: to join two or more groups (Example: 2 + 3 =)
Subtraction: to find the difference when two groups are compared or to find out how many are left when items are taken away from a group
Equation: a mathematical statement containing an equal sign; to show that two expressions are equal
Addend: any numbers being added together (Example: 3 + 4 = 7, 3 and 4 are the addends)
Count On: start from any given number and count forward
Count Back: start from any given number and count backwards
Equal Sign (=): a symbol used to show that two amounts have the same value (Example: 384 = 384)
Sum: the answer to an addition problem (Example: in 2 + 3 = 5, 5 is the sum)
Difference: the answer to a subtraction problem (Example: in 8 – 3 = 5, 5 is the difference)
Number Sentence: a sentence that includes numbers, operation symbols ( +,- ), a greater than or less than symbol ( >,< ) or equal sign (Example: 5 + 3 = 8, 25 < 32)
Fact Family: a collection of related addition and subtraction facts made from the same numbers (Example: For 7, 8, and 15, the addition/subtraction fact family consists of 7 + 8 = 15, 8 + 7 = 15, 15 - 8 = 7, 15 - 7 = 8)

Roll 2 or 3 dice with single digit numbers and add them together. (Example 4 + 2 or 4 + 2 + 1)
Roll 2 dice to create a 2-digit number and record it. Roll 1 die and add it to the 2-digit number you created. (Example: 47 + 6)
Add all the digits of your house number together.
Make a train with Legos or colored blocks. Write a number sentence for the different colors in the train.
Add the price of two items at a store.
Compare gas prices to find the lowest amount.
Start with 20 counters (beans, pennies, etc.) and roll two dice to make a 2-digit number. Subtract counters until you get to 0.
Give your student an addition or subtraction number sentence and ask them to make up a story problem to go with the number sentence.