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Review: numbers and patterns
Joyful Mathematics: Chapters 8–13
GoalReview tens and ones, comparing numbers and patterns.
New words
tens and ones · how we build a numberpattern · something that repeatsgreater · bigger
Explanation
Numbers up to 99 are made of tens and ones. 3 tens and 9 ones make 39. We count back by taking one less each time. To compare, look at the tens first. A pattern repeats in the same order. A number pattern goes up by the same amount each time.
Worked examples
| 45 | 46 | 47 | ? |
When we count by 10s from 20 we say 20, 30, 40, 50.
Pattern: peacock, duck, duck, peacock, duck, duck. The part that repeats is peacock, duck, duck.
Class activity
Review game. Roll a die twice. The first number is the tens and the second is the ones. Say the number, write it and say which of two rolls gives the greater number. Play five rounds.
Practice
1
What number is 7 tens and 2 ones?
72
2
Which is greater, 59 or 62?
62
3
Count back: 83, 82, 81, __
| 83 | 82 | 81 | ? |
80
4
What comes next?
Drum.
5
Count by 5s: 35, 40, 45, __
50