Addition and Subtraction

2nd Grade · Trimestre 1 · CCSS: 2.OA.A.1, 2.OA.B.2 · Dificuldade: fácil

Problema 1 de 5

0/5 marcados

Problema 1

A toy store has $43$ teddy bears on a shelf. A delivery brings $35$ more teddy bears. How many teddy bears are there in all?

$43 + 35 = \underline{\quad}$

Atalhos: ← → navegar · G gabarito · 1 acertei · 2 errei · 3 pular

Problemas

1. A toy store has $43$ teddy bears on a shelf. A delivery brings $35$ more teddy bears. How many teddy bears are there in all?

$43 + 35 = \underline{\quad}$

2. There were $72$ balloons at a party. After the party, $28$ balloons had popped. How many balloons were left?

$72 - 28 = \underline{\quad}$

3. Solve these as fast as you can (fluency within $20$ ):

a) $7 + 8 = \underline{\quad}$

b) $14 - 6 = \underline{\quad}$

c) $9 + 9 = \underline{\quad}$

d) $16 - 7 = \underline{\quad}$

e) $5 + 8 = \underline{\quad}$

4. A farmer picked $36$ apples in the morning and $47$ apples in the afternoon. Then he gave $15$ apples to his neighbor. How many apples does the farmer have now?

(Hint: this is a two-step problem.)

5. Lisa read $18$ pages of her book on Monday and $14$ pages on Tuesday. Her book has $50$ pages in total. How many pages does she still have left to read?

Gabarito — Addition and Subtraction

1. Add the tens: $40 + 30 = 70$ . Add the ones: $3 + 5 = 8$ . Combine: $70 + 8 = 78$ .

$43 + 35 = 78$

There are $78$ teddy bears in all.

2. Subtract using regrouping: $72 - 28$ .

Start with the ones: $2 - 8$ — we need to regroup. Borrow $1$ ten from $7$ tens (leaving $6$ tens) and add $10$ ones: $12 - 8 = 4$ ones.

Now the tens: $6 - 2 = 4$ tens.

$72 - 28 = 44$

There are $44$ balloons left.

3. a) $7 + 8 = 15$

b) $14 - 6 = 8$

c) $9 + 9 = 18$

d) $16 - 7 = 9$

e) $5 + 8 = 13$

4. Step 1: Find the total apples picked.

$36 + 47 = 83$

Step 2: Subtract the apples given away.

$83 - 15 = 68$

The farmer has $68$ apples now.

5. Step 1: Find how many pages Lisa read in total.

$18 + 14 = 32$

Step 2: Subtract from the total pages in the book.

$50 - 32 = 18$

Lisa still has $18$ pages left to read.