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Basic 2 · Mathematics · Counting, Representation and Cardinality

Skip Counting to 1000

In this topic you will count forwards and backwards in 2s, 5s, 10s, 50s and 100s.

By the end of these notes you should be able to:

  • Skip count in 2s, 5s and 10s
  • Skip count in 50s and 100s up to 1000
  • Count backwards in steps

What you already know

  • Numbers up to 1000

Copy everything that has a blue line on its left into your notebook. The other parts are for reading.

Strand
Number
Sub-strand
Counting, Representation and Cardinality
Indicator
B2.1.1.1.1 – Use number names ,counting sequences and how to count to find out how many

Introduction

A seller counts money in 5s and 10s to be quick. Counting in jumps is called skip counting.

1. Counting in 2s, 5s and 10s

Skip counting
StepCounting forwards
2s2, 4, 6, 8, 10, 12, 14
5s5, 10, 15, 20, 25, 30, 35
10s10, 20, 30, 40, 50, 60, 70

2. Counting in 50s and 100s

50s: 50, 100, 150, 200, 250, 300 …

100s: 100, 200, 300, 400 … 1000

Number line from 0 to 500 with jumps of 50
Figure 1: Counting in 50s Draw a number line and jump in 100s to 1000.Illustration: Sirbus

3. Counting Backwards

100, 90, 80, 70 … (back in 10s)

1000, 900, 800, 700 … (back in 100s)

Tip: Counting in 5s always ends in 5 or 0.

New words

skip count
To count in jumps of the same size.
forwards
Getting bigger.
backwards
Getting smaller.
step
The size of each jump.

Summary

  • We skip count in 2s, 5s, 10s, 50s and 100s.
  • Counting in 5s ends in 5 or 0.
  • We can skip count backwards too.

Class activity: Clap and Count

  1. Stand in a circle.
  2. Each person says the next number counting in 5s.
  3. Next, count backwards in 10s from 100.

You need: Bottle tops, Bundles of sticks, Locally made number cards

Exercises

Answer in your exercise book first, then check your answers.

  1. 1. What comes next? 5, 10, 15, ___

    • A. 16
    • B. 20
    • C. 25
    • D. 30
    Show answer
    Answer: 20Add 5 each time.

  2. 2. What comes next? 150, 200, 250, ___

    • A. 260
    • B. 300
    • C. 350
    • D. 255
    Show answer
    Answer: 300Add 50 each time.

  3. 3. 100, 200, 300 is counting in 100s.

    • A. True
    • B. False
    Show answer
    Answer: TrueAdd 100 each time.

  4. 4. 80, 70, 60, 55 is counting backwards in 10s.

    • A. True
    • B. False
    Show answer
    Answer: FalseIt should be 80, 70, 60, 50.

  5. 5. 2, 4, 6, 8, ______

    Show answer
    Answer: 10Add 2.

  6. 6. Count backwards in 100s from 1000 to 500.

    Show answer
    Answer: 1000, 900, 800, 700, 600, 500Take away 100 each time.

Homework

  1. Count your family's spoons or cups in 2s.