📌 1. Number & Place Value
Numbers to 1000
We read numbers from left to right. The leftmost digit has the highest value.
| Number | Hundreds | Tens | Ones |
|---|
| 342 | 3 | 4 | 2 |
| 509 | 5 | 0 | 9 |
| 880 | 8 | 8 | 0 |
342 = 3 × 100 + 4 × 10 + 2 × 1
Write the number: 5 hundreds, 2 tens, 7 ones = __________
Comparing Numbers
Use > (greater than), < (less than), or = (equal to)
342 < 509 (342 is less than 509)
880 > 342 (880 is greater than 342)
The mouth opens towards the bigger number! > <
Compare: 456 __________ 465
Ordering Numbers
Put numbers in order from smallest to largest (ascending) or largest to smallest (descending).
Smallest to largest: 123, 234, 345, 456
Largest to smallest: 456, 345, 234, 123
Order from smallest to largest: 567, 123, 456, 234
Odd and Even Numbers
- Even: Ends in 0, 2, 4, 6, 8 (can be shared equally)
- Odd: Ends in 1, 3, 5, 7, 9 (cannot be shared equally)
Even: 2, 4, 6, 8, 10, 12...
Odd: 1, 3, 5, 7, 9, 11...
Circle even numbers: 23, 44, 57, 88, 101
➕ 2. Addition
Basic Addition Facts
Add numbers from 0 to 20 quickly!
2 + 8 = 10 | 5 + 7 = 12 | 9 + 6 = 15
Use doubles: 6 + 6 = 12, then 6 + 7 = 13
Complete: 4 + 8 = __________ | 7 + 5 = __________
Adding 2-Digit Numbers (No Regrouping)
Add ones first, then tens.
23 45
+ 14 + 32
---- ----
37 77
Solve: 32 + 24 = __________ | 56 + 21 = __________
Adding 2-Digit Numbers (With Regrouping)
When ones add to more than 9, carry over to tens!
47 38
+ 25 + 19
---- ----
72 57
(7+2=9) (8+9=17, write 7, carry 1)
Solve: 29 + 16 = __________ | 45 + 28 = __________
Adding 3-Digit Numbers
Solve: 123 + 456 = __________
➖ 3. Subtraction
Basic Subtraction Facts
Subtract numbers from 0 to 20!
15 - 7 = 8 | 12 - 5 = 7 | 18 - 9 = 9
Think addition: 7 + ? = 15, so 15 - 7 = 8
Complete: 17 - 9 = __________ | 14 - 6 = __________
Subtracting 2-Digit Numbers (No Regrouping)
Subtract ones first, then tens.
48 76
- 23 - 45
---- ----
25 31
Solve: 59 - 34 = __________ | 88 - 56 = __________
Subtracting 2-Digit Numbers (With Regrouping)
When ones are too small, borrow from tens!
52 73
- 27 - 48
---- ----
25 25
(borrow 1 ten = 10 ones)
Solve: 61 - 34 = __________ | 82 - 47 = __________
Subtracting 3-Digit Numbers
Solve: 789 - 456 = __________
📝 5. Word Problems
Addition Word Problems
Keywords: altogether, total, in all, sum, plus
Tom has 23 marbles. Sarah gives him 15 more. How many does Tom have now?
23 + 15 = 38 marbles
There are 45 apples in a basket. 28 more apples are added. How many apples are there now?
Subtraction Word Problems
Keywords: left, remaining, difference, minus, less
Sarah had 56 stickers. She gave 24 to her friend. How many are left?
56 - 24 = 32 stickers
A bookstore had 100 books. 37 were sold. How many books are left?
Multiplication Word Problems
Keywords: groups of, times, each, altogether, product
There are 4 boxes. Each box has 6 cookies. How many cookies altogether?
4 × 6 = 24 cookies
There are 7 rows of chairs. Each row has 8 chairs. How many chairs?