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.
Math Salamanders Ltd.
Missing Subtraction Facts to 12 Sheet 2
In this subtraction instructional activity, students use the given numbers in the equation to solve the subtraction equations. Students solve 20 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, students 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
In 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.
Curated OER
Halves of Even Numbers to 20-Sheet 1
For this halves of even numbers worksheet, learners find halves of given numbers and match numbers to their halves. A reference web site is given for additional activities.
Curated OER
Halves of Even Numbers to 20, Sheet 2
For this halves of even numbers to 20 worksheet, students answer a set of 24 questions, finding halves of given numbers, then match numbers to their halves.
Curated OER
Addition: Missing Addends Tens and Ones
In this missing addend instructional activity, students fill in missing addends to arrive at given sums. All numbers are 2-digits. A reference web site is given for additional activities.
Curated OER
Subtraction: Fill in the missing digit
In this subtraction facts worksheet, students solve 30 subtraction problems that are missing a number. Students must fill in the missing number that makes the equation work.
Curated OER
Subtraction-2-Digit Numbers, Sheet 4
In this subtraction worksheet, students use subtraction facts to find missing numbers in problems. A reference web site is given for additional activities.
Curated OER
Column Subraction with Four Digits
In this column subtraction with four digits worksheet, learners solve fifteen subtraction problems using regrouping when it is needed.
Curated OER
Multiplication - 2 times table sheet 1
In this multiplication worksheet, students multiply the number 2 by the numbers 0 through 10, and fill in missing addend multiplication problems by 2 as well. Students complete 30 problems.
Curated OER
Multiplication - 3 Times Tables
In this multiplication practice worksheet, students solve 15 problems that require them to multiply 1 and 2-digit numbers by the number 3. Students also solve 15 problems that require them to fill in the blanks in 15 multiplication...
Curated OER
Multiplication: 5 Times Table
In this multiplication-5 times table learning exercise, students use the 5 times table to solve thirty multiplication problems then observe the ones digit in the five times table for a pattern.
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