1
Hop forward to add
Joyful Mathematics: Chapter 5
GoalAdd by hopping forward on a number line.
New words
number line · numbers in a row, in orderhop · a jump from one number to the nextland · the number where you stop
Explanation
A number line helps us add. Find the first number and stand there. Hop forward. Each hop is one step. 1 + 4: start at 1. Hop 4 steps. You land on 5. So 1 + 4 = 5.
Worked examples
2 + 6 = 8. Start at 2. Hop 6 steps forward. You land on 8.
7 + 2 = 9. Start at 7. Hop 2 steps. You land on 9.
9 + 1 = 10. One hop from 9 lands on 10.
Class activity
Frog on the cards. Write the numbers 1 to 10 on ten paper cards and put them in a row on a table. Use a small toy or a coin as the frog. Say a sum such as 4 + 3. The frog starts on 4 and hops 3 cards forward. Say where it lands.
Practice
1
Start at 2. Hop 3 steps. Where do you land?
5.
2
Start at 5. Hop 4 steps. Where do you land?
9.
3
What is 6 + 3?
9.
4
Start at 3. Hop 5 steps. Where do you land?
8.
5
A hop of 2 from 7 lands on which number?
9.