Grade 2 · Common Core Math · USA

Numbers are
everywhere! 🌊

In Grade 2 we explore hundreds, tens, and ones, add and subtract big numbers, and discover equal groups!

📦 Place Value — Every digit has a value based on its position
Hundreds
3
Tens
2
Ones
5
= 325
3 hundreds + 2 tens + 5 ones = 325
5units
15problems
2ndgrade CC
0 / 15 solved 🌊
Unit 1

📦 Place Value

Each digit in a number has a place — ones, tens, and hundreds. The position tells us how much each digit is worth.

Remember: In the number 456 — the 4 is in the hundreds place (= 400), the 5 is in the tens place (= 50), and the 6 is in the ones place (= 6).
What is the tens digit in 382?→8
Q 1

What digit is in the tens place in the number 473?

Q 2

What number has 4 hundreds, 2 tens, and 6 ones?

Q 3

What is 500 + 70 + 8?

Unit 2

➕ Addition within 100

When adding 2-digit numbers, add the ones column first, then the tens column. If the ones add up to 10 or more, carry the extra ten over!

Example: 47 + 36: ones: 7+6=13 (write 3, carry 1). Tens: 4+3+1(carry)=8. Answer: 83.
34 + 25=59
Q 4

46 + 28 = ?

Q 5

55 + 39 = ?

Ones: 5+9=14. Write 4, carry 1. Tens: 5+3+1=9. Answer: 94.
Q 6

A store has 38 red balloons and 47 blue balloons. How many balloons are there altogether?

Unit 3

➖ Subtraction within 100

For subtraction, sometimes the top ones digit is smaller than the bottom. We borrow a ten from the tens column to help!

Example: 72 − 35: ones: can't do 2−5, so borrow a ten: 12−5=7. Tens: 6−3=3. Answer: 37.
90 − 34=56
Q 7

83 − 47 = ?

Q 8

61 − 28 = ?

Borrow from tens: 11−8=3 (ones). 5−2=3 (tens). Answer: 33.
Q 9

There are 94 crayons. 56 are used. How many are left?

Unit 4

🔵 Equal Groups

When equal groups are put together, we can skip-count to find the total. This is the beginning of multiplication!

Equal groups: 4 groups of 3 means four groups, each with 3 things: 3, 6, 9, 12. We can also write this as 4 × 3 = 12.
5 groups of 4→4, 8, 12, 16, 20
Q 10

3 groups of 6 = ?

Skip count by 6 three times: 6, 12, 18!
Q 11

5 groups of 5 = ?

Q 12

There are 4 bags. Each bag has 7 apples. How many apples in total?

Unit 5

📏 Measurement & Time

We measure lengths in centimeters (cm) and inches. We tell time in hours and minutes on a clock.

Units to know: 100 cm = 1 meter  ·  12 inches = 1 foot  ·  3 feet = 1 yard  ·  60 minutes = 1 hour.
How many cm more?→Longer − Shorter = Difference
Q 13

A pencil is 17 cm long. An eraser is 5 cm long. How much longer is the pencil?

Q 14

How many minutes are in 1 hour?

Q 15

There are 12 inches in 1 foot. How many inches are in 3 feet?

3 groups of 12: 12, 24, 36!