Number bonds help your child “see” math facts and fact families. They can help show that the equals sign can be at the beginning or at the end of the number sentence!
When the number bond looks like this, read it this way! Four plus three equals seven. When the number bond looks like this, read it this way! Three plus four equals seven.
When the number bond looks like this, read it this way! Seven minus three equals four. When the number bond looks like this, read it this way! Seven minus four equals three.
But, wait! These number sentences can be written differently, and still be true. Watch this! If we know four plus three equals seven is true, then we also know seven equals four plus three is true. One fact family organized in a number bond can make eight number sentences.
Let’s look at this fact family all together… Notice that the answer can be at the beginning or end of a number sentence.
4 + 3 = 7 3 + 4 = 7
7 = 4 + 3 7 = 3 + 4
7 – 4 = 3 7 – 3 = 4
3 = 7 – 4 4 = 7 – 3
With practice, your child will see the relationship between all the number sentences of a fact family!
Can you write the eight number sentences for these fact families? Practice this with your child!
Grade 1 Common Core Standards
Operations & Algebraic Thinking: Understand and apply properties of operations and the relationship between addition and subtraction.
(1.OA.3) Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) Student need not use formal terms for these properties.
(1.OA.4) Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20.