Curated OER
Count Backwards and Complete the Series
In this count backwards activity, students count backwards from 100 to 95 and complete the series by filling in the missing numbers. Students fill in 3 missing numbers.
Curated OER
Mentally Add and Subtract 10 or 100
Here are some number lines that need to be completed. There are two number sequences, one to test addition skills and the other for subtraction. Both sequences include counting by 10, but the subtracting question has scholars count...
Curated OER
Counting Back in Tens
In this counting backwards in tens worksheet, 3rd graders count down in tens from 80 to 30, 100 to 50, 110 to 60 and 120 to 70. Students fill in each missing number on each row.
Curated OER
Count by 5s, 10s, and 100s
These number sequences are missing digits! Each of the six has one missing number and scholars must figure out what it is. Here's the pattern, though: all of these sequences involve counting by 5s, 10s, and 100s. Learners add one of...
Curated OER
Take Whole Tens: Subtraction with a Number Line
A tens number line helps your class understand how to "hop" backward to subtract by 10's. Ten practice equations are expressed as math sentences (in word form) using the expressions "take __ from __" and "subtract." A little cartoon...
Curated OER
The Palindromic Year Problem
In this algebra activity, 9th graders solve word problems containing palindromic years and count how many plaindromic years there are between 1 AD and the next 100 years.
Curated OER
The Stellar Magnitude Scale
In this stellar magnitude scale instructional activity, students use a scale showing the magnitude of objects in the sky to answer 5 questions about the brightness of the moon, the planets and stars.