There are 25 kids on a playground. 11 go inside. Then 7 more come out. How many kids are outside now? — 21.Step 1: 25 − 11 = 14. Step 2: 14 + 7 = 21 kids outside.
Max scores 34 points in round 1 and 27 points in round 2. He needs 75 points to win. How many more points does he need? — 14.Step 1: 34 + 27 = 61 points. Step 2: 75 − 61 = 14 more points needed.
A shelf holds 50 books. 18 are taken out and 6 are put back. How many books are on the shelf now? — 38.Step 1: 50 − 18 = 32. Step 2: 32 + 6 = 38 books.
Which clue word often signals ADDITION in a word problem? — In all / total."In all" and "total" usually mean we add the amounts together.
Which clue word often signals SUBTRACTION? — How many fewer."How many fewer" asks us to find the difference, which means subtraction.
A farmer has 60 eggs. He sells 24 in the morning and 18 in the afternoon. How many eggs are left? — 18.Step 1: 24 + 18 = 42 eggs sold. Step 2: 60 − 42 = 18 eggs left.
Rosa picks 32 flowers on Monday and 15 on Tuesday. She gives a bouquet of 20 flowers to her mom. How many flowers does Rosa have left? — 27.Step 1: 32 + 15 = 47 flowers. Step 2: 47 − 20 = 27 flowers left.
A class of 28 students goes on a field trip. 9 students are absent. Of those present, 7 ride with parents. How many ride the bus? — 12.Step 1: 28 − 9 = 19 present. Step 2: 19 − 7 = 12 ride the bus.
When solving a two-step problem, what should you do with the answer to Step 1? — Use it in Step 2.The answer to Step 1 becomes the starting number or part of the calculation in Step 2.
A library has 95 books on two shelves. One shelf has 43 books. Then 12 more books are returned. How many books in total now? — 107.Step 1: total stays relevant: 95 + 12 = 107 total books after return.
What is 15 − 7? — 8.15 − 7 = 8. Think: 7 + 8 = 15, so 15 − 7 = 8.
What is 13 − 6? — 7.13 − 6 = 7. Check: 6 + 7 = 13. ✓
What is 14 − 9? — 5.14 − 9 = 5. Check: 9 + 5 = 14. ✓
Which doubles fact helps you solve 7 + 8? — 7 + 7 = 14.7 + 7 = 14, so 7 + 8 = 15 (one more). Near-doubles strategy!
What strategy works best for 9 + 4? — Make a ten: 9 + 1 = 10, then add 3 more.9 + 1 = 10, then 10 + 3 = 13. The make-a-ten strategy is efficient here.
What is 20 − 8? — 12.20 − 8 = 12. Think: 8 + 12 = 20.
What is 16 − 8? — 8.16 − 8 = 8. This is the reverse of the doubles fact 8 + 8 = 16!
Which pair of numbers makes 10? — 8 and 2.8 + 2 = 10. Knowing pairs that make 10 is the foundation of the make-a-ten strategy.
What is 18 − 9? — 9.18 − 9 = 9. This is the reverse of the doubles fact 9 + 9 = 18!
What is 7 + 6? (Use near-doubles: 7 + 7 = 14) — 13.7 + 6 is one less than 7 + 7 = 14, so 7 + 6 = 13.
How does repeated addition relate to equal groups? — Repeated addition adds the same number over and over, just like equal groups.Equal groups and repeated addition are the same concept: 3 groups of 4 = 4 + 4 + 4.
2 + 2 + 2 + 2 + 2 represents how many groups of how many? — 5 groups of 2.We are adding 2 five times, so this is 5 groups of 2.
6 packs of crayons with 8 crayons each. How many crayons total? — 48.8 + 8 + 8 + 8 + 8 + 8 = 48 crayons.
Skip count to find 4 groups of 5: 5, ___, ___, ___. What are the missing numbers? — 10, 15, 20.Skip count by 5: 5, 10, 15, 20. Four hops = 20.
Which number sentence represents "7 groups of 3"? — 3 + 3 + 3 + 3 + 3 + 3 + 3.7 groups of 3 = adding 3 seven times: 3 + 3 + 3 + 3 + 3 + 3 + 3 = 21.
If each row has 9 stars and there are 3 rows, how many stars in total? — 27.9 + 9 + 9 = 27 stars. Three rows of 9.
What is the total for 8 groups of 2? — 16.2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 16.
A garden has 5 rows of bean plants with 6 plants in each row. How many bean plants are there? — 30.6 + 6 + 6 + 6 + 6 = 30 plants.
Equal groups are important because they introduce: — Multiplication.Repeated addition of equal groups is the foundation of multiplication.
Which number is odd: 26, 32, 41, 50? — 41.41 ends in 1, which is an odd digit. The others end in 6, 2, and 0 — all even.
What happens when you add two even numbers? — Always get an even number.Even + Even = Even. Example: 4 + 6 = 10 (even). The pairs always match up!
What happens when you add two odd numbers? — Always even.Odd + Odd = Even. Example: 3 + 5 = 8. The two leftover singles pair up!
What happens when you add an odd number and an even number? — Always odd.Odd + Even = Odd. Example: 3 + 4 = 7. The one leftover from the odd number stays unpaired.
Is 100 odd or even? — Even.100 ends in 0, which is even. Any number ending in 0 is even.
Is 573 odd or even? — Odd.573 ends in 3, which is odd. Just check the last digit!
You pair up 11 socks. How many are left over? — 1.11 is odd (ends in 1). You get 5 pairs with 1 sock left over.
Which set of numbers shows the even numbers between 10 and 20? — 10, 12, 14, 16, 18, 20.Even numbers between 10 and 20 include 10 itself through 20: 10, 12, 14, 16, 18, 20.
A number ends in 6. What do you know for certain? — It is even.Any number ending in 6 is even — regardless of its other digits.