Number Facts and Mental Math
Building Strong Number Foundations Year 2 Mathematics Adding and Subtracting within 20
What Are Number Facts?
Number facts are math equations we know by heart Like knowing 5 + 5 = 10 without counting They help us solve problems quickly We use them every day!
Quick Number Warm-Up
Show me fingers for: 3 + 2 7 - 1 4 + 4 10 - 3
Doubles Facts
Doubles are adding the same number twice 1 + 1 = 2 2 + 2 = 4 3 + 3 = 6 Can you see the pattern?
Think and Share
If you know 6 + 6 = 12 What is 6 + 7? Talk to your partner about your thinking
Making 10 Strategy
10 is a friendly number! We can break numbers apart to make 10 8 + 5 = 8 + 2 + 3 = 10 + 3 = 13 Find the parts that make 10 first
Number Bond Practice
Complete these number bonds: _ + _ = 10 _ + 7 = 10 4 + _ = 10 Use your fingers or draw pictures to help!
Subtraction Strategies
{"left":"Count back from the bigger number\nUse addition facts you know","right":"Think: What plus 7 equals 12?\n12 - 7 = 5 because 7 + 5 = 12"}
Math Mindset
"Mistakes help our brains grow!" - Every time we work hard on math problems, we get smarter
Let's Practice Together!
Remember our strategies: Use doubles and near doubles Make 10 when adding Think addition for subtraction You're becoming math experts!