Learn to skip count by 10s through multiples of 100.
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Students learn to skip count by 10s through multiples of 100 up to 1,000. They practice skip counting forward and backward.
Students will be able to skip count forward and backward by tens to 1,000, crossing multiples of 100.
Practice with jumps of 100. First as a class, and then by dragging the numbers from 100 to 1,000 to the where they belong on the interactive whiteboard. Then practice skip counting in jumps of 10 between multiples of 100 on the number line.
Show students how you can easily skip count by 10s through a multiple of 100 on a number line. If you skip count from 10 through a multiple of 100, you see that the tens number turns into a hundreds number and a third digit is added (90 - 100 - 110). Then explain how you count from one multiple of 100 to the next multiple of 100 (190 - 200 - 210). Point out which numbers change and where the change happens. The 1 from 100 becomes the 2 of 200. If you take a random multiple of ten and skip count through the next multiple of 100, the number in the tens place moves to the hundreds place and you add a zero where the tens place was (96 - 106 - 116), The digit in the ones place stays the same. Ask students to practice by skip counting forward by tens on the number line. Write the answers on the interactive whiteboard. Then explain how to skip count backward by 10s using the number line. If you skip count backward by 10s from a multiple of 100, the multiple of 100 also becomes smaller. (410 - 400 - 390). Point at the number line and count from right to left and stop to mark when the number in the hundreds place changes. Ask students to practice individually and then discuss and share their answers as a class. Ask them to complete the four number sequences.
Check that students are able to skip count forward and backward by 10s through multiples of 100 by asking the following questions:
- What happens when you skip count across a multiple of 100?
- How can you skip count forward and backward by 10s on a number line?
- Skip count forward by 10s: 94 - ... - ... - ...
- Skip count forward by 10s: 380 - ... - ... - ...
- Skip count backward by 10s: ... - ... - ... - 220
- Skip count backward by 10s: ... - ... - ... - 710
Students start by skip counting forward by 10s two jumps on the number line. They then practice skip counting backward. They cross multiples of 100 while doing so. They also practice without the visual aid of a number line.
Practice skip counting forward and backward by having students fill in the missing numbers. Make sure to point out where the number changes or they cross the tens or hundreds. This task can also be done in a game format in which the students must jump in the classroom and say the numbers out loud. Discuss that it is useful to be able to skip count by 10s through multiples of 100 so that you can easily count larger numbers.
Students who have difficulty with this learning goal can be supported by making use of manipulatives like MAB blocks. Have them set out the number that they are starting from and add a block of 10 for every jump. You can also support them by having students draw their jumps of 10 on a number line. Students who are already comfortable with this learning goal can be challenged by skip counting in their heads, or skip counting from random numbers like 371, 546, 889, etc. Have them write the number sequence as they take the jumps forward or backward by tens.
Optional: MAB blocks or other manipulatives
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