Look at these sequences. What is happening?

1
Look at these sequences.What is happening?

• 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• 10, 20, 30, 40, 50, 60, 70, 80, 90,100

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
2
Counting on in tens.

• Counting on in tens means adding ten on to the
  previous number in the sequence.
• Practice
• 10, 20, 30, , , , , , , , ,

Now try starting at 100 100, 110, ., .., ..,
.., ..,
3
Counting back in tens.

• Counting back in tens means taking ten away from
  the previous number in the sequence.
• Try it
• 100, 90, .., .., .., ..,
• Now try to complete this sequence. Can you fill
  in the gaps?
• 120, .., 100, , , 70

4
Counting on and back in hundreds.

• Counting on and back in hundreds is similar to
  the tens but this time you use hundreds instead.
• Counting on
• 100, 200, 300, 400, 500
• Counting back
• 500, 400, 300, 200, 100

5
Look carefully at this sequence!

• What changes in this sequence?
• 256, 356, 456, 556, 656, 756, 856, 956

What stays the same?
6
Look at these sequences.Discuss with your friend
what is happening in each one.

• 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

122, 132, 142, 152, 162, 172, 182
421, 521, 621, 721, 821, 921, 1021