Week 07 · Turn-around facts and three numbers
Tuesday
Start with the bigger number
// Rosie hops both ways
⏱ about 15 min
Tuesday: Start with the bigger number
Rosie has 2 carrots in her bag.
Bennie gives her 9 more.
"Do I count on from 2 or 9?" she asks.
Learn it: count on from the bigger number
Look at 2 + 9.
Counting on 9 from 2 takes a long time.
Turn it around: 9 + 2.
Start at 9. Count on 2, "10, 11."
So 2 + 9 = 11.
Two hops from 9 land on 11.
WHICH IS EASIER?
- Read the question.
- Tap your answer.
Which is easier: 2 + 9 or 9 + 2?
Which is easier: 3 + 12 or 12 + 3?
Which is easier: 1 + 15 or 15 + 1?
Which is easier: 4 + 10 or 10 + 4?
TURN IT, THEN COUNT ON
- Read the question.
- Tap your answer.
2 + 9 = ?3 + 12 = ?
1 + 15 = ?
4 + 10 = ?
Turn-arounds with bigger numbers
Turn-around facts work for all numbers.
3 + 14 = 14 + 3. Both make 17.
FIND THE MISSING NUMBER
- Read the question.
- Tap your answer.
3 + 14 = 14 + ?
5 + 11 = 11 + ?
2 + 16 = 16 + ?
Start at the bigger number and count on.
| Number sentence | True or false? |
|---|---|
| 2 + 13 = 13 + 2 | ? |
| 1 + 18 = 19 | ? |
| 4 + 12 = 15 | ? |
WHY THIS EXERCISE12 + 4 is 16, not 15.
ROSIE'S STORIES
- Read the question.
- Tap your answer.
Rosie has 3 carrots. She finds 11 more. How many now?
Rosie hops 2 times, then 17 more. How many hops?
Try it
Put 12 blocks in a tower.
Hold 3 more blocks in your hand.
Count on from 12 to find the total.
Hold 3 more blocks in your hand.
Count on from 12 to find the total.
Word Spot: old, men
Here are new sight words.
Look at each word. Say it. Spell it.
Old: O-L-D.
Men: M-E-N.
FIND THE WORD
- Listen to the word.
- Tap it.
Find the word you hear.
Find the word you hear.
Find the word you hear.
Find the word you hear.
FILL THE GAP
- Listen to the sentence.
- Tap the missing word.
The tree is very ___.
The ___ carried the boxes.
Nice counting on! Tomorrow we add three numbers.