91
How many more? Planets
Textbook Part 3, pp. 36–37
GoalCompare the values of expressions; answer “how many more/fewer” questions.
New words
planet · sayyoramoon (satellite) · yo‘ldoshSolar System · Quyosh tizimi
Explanation
8 planets orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. The largest is Jupiter and the smallest Mercury. To compare an expression with a number, first find its value: (53 + 45) = 98; 98 − 67 = 31 — the expression is 31 more.
Worked examples
The first row got 14 stars and the second row 19: 19 − 14 = 5 more.
How much less is 30 than (20 + 50)? 70 − 30 = 40.
Class activity
Planet parade: 8 children take planet cards and line up from largest to smallest (Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury).
Practice
1
How much more is (53 + 45) than 67?
31
2
Which planets have no moons?
Mercury and Venus
3
16 is some amount less than 18. Find the number that is the same amount less than 7.
5
4
How many natural moons does Earth have?
1 — the Moon