Biology Junction
Amphibians
Biologists know of more than 2,300 living species of amphibians. Learn more about the four orders of amphibians with an interesting presentation. It explains the similarities and differences between the thousands of species of...
American Museum of Natural History
The Tree of Life
Groups of species can have more in common than meets the eye. An interactive cladogram shows some of the connections between important groups of species. Learners click on sections of the diagram to learn more about the connections or on...
Curated OER
Examining the Stages in Ecological Succession
In this ecosystems worksheet, students use illustrations and descriptions of four ponds to determine the order of succession. Students complete 8 fill in the blank questions and 5 short answer questions.
Curated OER
Lighthouse Dot-To-Dot
In this lighthouse dot-to-dot worksheet, students connect the dots with numbers in order from one to twenty-one to draw a picture of a lighthouse.
Curated OER
Squares
In this squares worksheet, students can either count the squares or cut the squares on this sheet. Students cut or count 15 squares.
Curated OER
Addition - Up to 12
For this addition worksheet, learners solve the horizontal addition problems. Students count on from the addend given to get the find the missing addend.
Curated OER
Column Addition -No Carrying, 2-Digits
In this addition worksheet, students complete 12 problems, adding 2-digit numbers. Problems do not require carrying. A reference web site is given for additional activities.
Curated OER
Column addition - 2 digits sheet 6
In this column addition worksheet, students put two digit addition problems from horizontal to vertical and then solve. Students complete 12 addition problems.
Math Salamanders Ltd.
Missing Subtraction Facts to 12 Sheet 2
In this subtraction instructional activity, learners use the given numbers in the equation to solve the subtraction equations. Students solve 20 problems.
Curated OER
Column Subtraction with Two Digits
In this subtraction with two digits worksheet, students solve twelve two digit subtraction problems using regrouping when needed.
Curated OER
Column Subtraction - Two Digits
In this column subtraction with two digits worksheet, students use borrowing or regrouping to complete twelve two digit problems.
Curated OER
Addition-Up to 20 (Sheet #1)
In this addition worksheet, students practice their adding with one--digit and two-digit numbers. Students complete the worksheet by solving twenty-four addition problems.
Curated OER
Addition-Up to 20 (Sheet #2)
In this addition instructional activity, students practice their adding skills. Students complete the instructional activity by filling in the missing number in each of the forty addition problems.
Curated OER
Column Addition 3 Digit Sheet
In this addition worksheet, students add three digit numbers together. Three problems have the students adding three-three digit numbers together. The students work through 15 problems.
Curated OER
Column Addition with Three Digits
In this column addition with three digits worksheet, students solve fifteen addition problems using carrying when it is needed, some problems have 3 addends.
Curated OER
Column Addition- 3 Digits, Sheet 6
In this addition activity, students complete a set of 12 problems, adding 2 and 3 digit numbers. Numbers must be arranged vertically and problems completed. A reference web site is given for additional activities.
Curated OER
Column Subtraction: 3 Digits, Horizontally
In this column subtraction with 3 digits worksheet, students solve twelve horizontal subtraction problems with three digits by rewriting them in column form with regrouping.
Curated OER
Multiplication up to 5x5 sheet 1
In this multiplication worksheet, learners complete addition problems and the multiplication problems that go with them. Students complete 20 problems up to 5x5.
Curated OER
Multiplication to 5x5 sheet 3
In this multiplication worksheet, students fill in the missing addends to the multiplication problems up to 5x5. Students complete 40 problems.
Curated OER
Multiplication to 5 x 5
In this multiplication to 5x5 worksheet, learners use their knowledge of the times tables from 1 to 5 to fill in the missing numbers in a chart.
Curated OER
Multiplication to 5x5 sheet 5
In this multiplication worksheet, students multiply numbers 1 through 5 in a multiplication chart. Students complete 6 charts with 25 problems in each one.
Curated OER
Multiplication to 5x5 blank grid
In this multiplication worksheet, students fill in a blank grid with 5 numbers on top and 5 numbers on the side and multiply them. Students complete this for 6 grids.
Curated OER
Understanding Division as Grouping
In this understanding division as grouping worksheet, 3rd graders read two word problems, then draw groups to represent the problem in order to solve it.
Curated OER
Counting in halves in sequences 1
For this counting by halves worksheet, students fill in the blanks to the number line where they write numbers that count by halves. Students complete 12 problems.
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