Bài 20: Introducing fifty to fifty nine

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Introducing 50 to 59

Starry, I’m sure you know what this number is!

You don’t, it’s the number 50.

Remember we learnt counting number from 40 to 49. The number 50 comes after the number 49.

5 and 0 . 50, f-i-f-t-y.

Let’s me explain with these beads Starry!

Each string has 10 beads.

So ten + ten + ten + ten + ten .
that’s 5 tens Starry, the number 50.

Ah ha…. Now you understand.

Now suppose I add 1 more beads to these 5 sets of ten beads.

That 5 tens plus 1 units Starry, 5 tens 1, 51, f-i-f-t-y o-n-e.

And on adding 2 beads we get 5 tens 2, 52, f-i-f-t-y t-w-o.

Next, 5 sets of ten beads and 3 beads is 5 tens 3, 53, f-i-f-t-y t-h-r-e-e.

Now Starry, let’s add 1 more bead.
5 sets of ten beads plus 1-2-3-4 beads that 5 tens 4, 54, f-i-f-t-y f-o-u-r

Easy, isn’t it?

Now 5 sets of ten beads plus 5 is 5 tens 5 units, 55, f-i-f-t-y f-i-v-e

And 5 tens and 6 beads is 5 tens 6, 56, f-i-f-t-y s-i-x

Let add 1 more bead Starry, 5 tens plus 1-2-3-4-5-6-7 beads that’s 5 tens 7, 57, f-i-f-t-y s-e-v-e-n.

With 1 more bead it becomes 5 tens 8, 58 f-i-f-t-y e-i-g-h-t.

And finally Starry, we have 5 tens and 1-2-3-4-5-6-7-8 and 9 beads, that’s 5 tens 9, 59, f-i-f-t-y n-i-n-e.

Starry, in ascending order we can now count from 50 and 51-52-53-54-55-56-57-58 and 59.

And starting from the biggest number we count in the descending order at 59-58-57-56-55-54-53-52-51 and 50.

Now that we have learnt to count Starry.
Let’s do an activity together!

Match the column, shall we begin!

52 that’s f-i-f-t-y t-w-o

59, that’s Starry, match it with 5 tens 9 units.

50 is five tens

53 that’s 5 tens 3

58 that’s f-i-f-t-y e-i-g-h-t

51 is five tens 1

57 match it with f-i-f-t-y s-e-v-e-n.

Here is the number line Starry!

It’s start from 50 and go on to 59.

In this activity you have to look at the number line and fill in the missing numbers in the ascending or descending order.

____51 ___ 53 ___

The missing numbers are 50-52 and 54

57 ___55 ___   ___
That’s counting in the descending order Starry, so we have 57-56-55-54 and 53.

56 ____ 54 ___ 52 ____

Counting in the descending order again. The missing numbers are 55-53 and 51.

52 ___ 54 ___  ___

Now counting forward 52-53-54-55 and 56

Starry, you must be really happy.

You have learnt to count from 50 to 59

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