1
Five tens and more
Joyful Mathematics: Chapter 8
GoalRead and write the numbers 51 to 60 in tens and ones.
New words
sixty · the name for 6 tens, written 60fifty-four · the name for 54new ten · 10 ones make one more ten
Explanation
Fifty is 5 tens. Each next number adds one more one. 5 tens and 4 ones make 54, fifty-four. When the ones reach 10, they make a new ten. 5 tens and 10 ones make 6 tens. That is 60, sixty.
Worked examples
| Tens | Ones | Number |
|---|---|---|
| 5 | 2 | 52 |
5 tens and 8 ones make fifty-eight.
Fifty-nine and one more makes sixty. 6 tens and no ones.
Class activity
Ten lines. On paper draw ten short lines and circle them as one ten. Do this five times. Then draw 6 single lines. Count the tens, then the ones. Write the number and say its name.
Practice
1
Count the tens and the ones. Which number is this?
53
2
Write 5 tens and 7 ones as a number.
57
3
What number is 6 tens?
60
4
Write fifty-nine as a number.
59
5
Two numbers are hidden by a question mark. Which are they?
54 and 58.