23 problems graded by difficulty (★ easy, ★★ medium, ★★★ hard). Try first, without looking at the solutions!
1 Counting blocks ★★★
The picture shows two groups of blocks.
What number do the two groups make together? Write the addition sentence.
2 Add the tens and the ones ★★★
Find \(51 + 36\).
3 Subtract with no trading ★★★
Find \(68 - 25\).
4 Another subtraction ★★★
Find \(79 - 46\).
5 Tens and ones puzzle ★★★
What is \(3\) tens \(8\) ones plus \(2\) tens \(1\) one? Write your answer as a number.
6 Basketball points ★★★
The Eagles scored \(32\) points in the first half of a basketball game and \(45\) points in the second half. How many points did they score in all?
7 Apple stand ★★★
A farm stand had \(89\) apples. By noon it had sold \(54\) of them. How many apples are left?
8 True or false? ★★★
Say whether each sentence is true or false. Explain.
- \(30 + 40 = 70\)
- \(56 - 24 = 42\)
9 Add with regrouping ★★★
Find \(38 + 27\). Show how many ones you have and what you do with them.
10 Another regrouping sum ★★★
Find \(49 + 36\).
11 Trade a ten ★★★
Find \(71 - 28\). Tell how you trade a ten for ones.
12 Subtracting from a multiple of ten ★★★
Find \(90 - 46\).
13 Jumping on a number line ★★★
Use an open number line to find \(54 + 29\). Tell where you start and what jumps you make.
14 Find the missing number ★★★
Solve \(47 + \square = 82\).
15 Find Leo’s mistake ★★★
Leo wrote \(45 + 27 = 62\). Is he right? If not, explain his mistake and fix it.
16 Sticker graph ★★★
The bar graph shows how many stickers four children collected.
- How many stickers do Ava and Cam have together?
- How many more stickers does Cam have than Dee?
17 Four numbers ★★★
Find \(14 + 23 + 31 + 22\).
18 Look for tens ★★★
Find \(18 + 27 + 15 + 34\). Explain how you added.
19 The library cart ★★★
A school library had \(63\) books on a cart. Students returned \(28\) more books. Then \(35\) books were checked out. How many books are on the cart now?
20 Missing start ★★★
Solve \(\square - 38 = 27\). Explain your thinking.
21 Check Sam’s answer ★★★
Sam says that \(93 - 47 = 56\). Use addition to check his answer. Is he right? If not, find the correct answer.
22 The city bus ★★★
A bus had \(58\) riders. At the first stop, \(19\) riders got off. At the next stop, \(26\) riders got on. How many riders are on the bus now?
23 Two mystery numbers ★★★
Two numbers add up to \(71\). One of them is \(29\). What is the other number? How much bigger is the bigger number than the smaller one?
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