Ray's New Primary Arithmetic · Lesson II · Unit 1: Counting and writing numbers
2. Numbers from 11 to 40
Goal: Your child reads and writes the numbers from eleven to forty, and sees that twenty-one means two tens and one more.
You'll need
- About 20 small counters: dried beans, buttons, pennies or pebbles (the book suggests marbles, beans or pebbles), at least 40 of them
- A slate, small whiteboard or paper and pencil
What's in the book
A table of the number words from eleven to forty with their figures. The note says counting objects is now carried to 40, and that one column, or less, is enough for one lesson.
The lesson, step by step
Review 1 to 10
Have your child count ten beans and write the figures 1 to 10 quickly.
Make a ten
Count out ten beans and push them together into a pile, or put them in a small cup.
SayThis is a ten.
Put 1 more bean beside it. Say: Ten and one is eleven. We write it 1 and 1: one ten and one more.
Build the teens
Add one bean at a time beside the ten and name each number: twelve, thirteen ... up to twenty. At twenty, make a second ten.
Read the table
Open the book page. Read one column together: the word and the figure. Then let your child read it alone.
Twenty-one, thirty-one
Show two tens and one: twenty-one, written 21. Three tens and one: thirty-one, 31. Ask: How many tens in 34? How many ones?
Write a few
Say five numbers from the column you read and have your child write them.
Afterwards
Read and write the next column of the table tomorrow, until all of 11 to 40 is easy. Don't do it all in one sitting.
Tip
Eleven and twelve sound nothing like "ten-one" and "ten-two", so children find them hardest. Point that out, and practise them on their own.