Ray's New Primary Arithmetic · Lesson XXI · Unit 3: Addition

21. Review of addition, and counting by 2s, 3s, 4s and 5s

Goal: Your child answers mixed addition facts quickly and counts on by 2s, 3s, 4s and 5s.

⏱ About 15 minutes · 4 steps

Open it at the Internet Archive ↗

You'll need

  • A slate, small whiteboard or paper and pencil

What's in the book

Mixed facts with two and then three numbers, such as "How many are 2 and 2 and 2?", and counting exercises such as "Begin with 1 and count by 2's to 19."

The lesson, step by step

  1. Mixed facts

    Ask the two-number facts from the page, out of order. Keep the pace brisk.

  2. Three numbers

    Ask: How many are 2 and 2 and 2? Show how to add the first two, then add the third.

  3. Count by 2s

    Count together from 2 by 2s to 20, then from 1 by 2s to 19, as the book asks.

  4. Count by 3s, 4s, 5s

    Do the other counting exercises on the page. Clap on each number to keep the rhythm.

Afterwards

Counting by 2s, 5s and 10s on walks or in the car.

Tip

Counting by a number is the first step towards the times tables.

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