The printed title is Addition and Subtraction Adventure!, and the sheet samples every 1st grade Operations and Algebraic Thinking standard in four short parts. Students count frogs and apples, complete the 4, 5, 9 fact family, judge four equations as true or false, then draw and solve Sammy the squirrel's acorn story. An answer key covers each part, including the full fact family.
1.OA.1
“Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.”
The frog, apple and squirrel stories are adding-to and taking-from problems with the result unknown.
1.OA.2
“Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.”
The lightest touch on the sheet: no problem here adds three numbers, so pair it with the Adding Three Numbers worksheet for full coverage.
1.OA.3
“Apply properties of operations as strategies to add and subtract.”
The true or false row 3 + 7 = 7 + 3 turns on the commutative property, and Part 2 builds all four facts from one number trio.
1.OA.4
“Understand subtraction as an unknown-addend problem.”
The fact family in Part 2 shows subtraction as the flip side of 4 + 5 = 9.
1.OA.5
“Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).”
Counting on 3 from 5 solves the frog problem without recounting the whole pond.
1.OA.6
“Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8+ 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13- 3 - 1 = 10 − 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).”
Every fact stays within 20, from 5 + 3 up to Sammy's 7 + 6.
1.OA.7
“Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.”
Part 3 lives on the equal sign: 10 - 2 = 5 + 3 puts an operation on both sides.
1.OA.8
“Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.”
Completing the 4, 5, 9 family leaves the unknown in a different position on every line.
Two picture problems open the sheet. 5 frogs are on the pond and 3 more hop in, then a bird eats 2 of the 8 apples in the basket. Students write the answers to 5 + 3 and 8 - 2 on the lines.
Using the numbers 4, 5 and 9, students complete the four related facts, starting from 4 + 5 = ______ and 5 + 4 = ______.
Four equations get a tick for true or false: 6 + 2 = 8, 9 - 4 = 4, 3 + 7 = 7 + 3 and 10 - 2 = 5 + 3. Only 9 - 4 = 4 is false.
Sammy the squirrel had 7 acorns and found 6 more under an oak tree. Students draw a picture in the box, then write and solve the equation 7 + 6.
Unit review
Run it at the end of the operations unit. The four parts touch word problems, fact families, the equal sign and a drawn model, so it shows the spread of the class in about ten minutes.
Watch question 4
9 - 4 = 4 catches students who see two matching digits and tick true. Ask anyone who missed it to prove the answer with counters.
Sub plans
The sheet stands alone: instructions sit above each part and the answer key covers everything, including the fact family.
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