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• ### 12.1

1. 1. Lesson 12.1 Multiplying 2-digit Numbers
2. 2. Mr. Henson grows tomatoes. There are 35 plants on each tray. Mr. Henson has 88 trays. How many tomato plants does he have in all? <ul><li>Step 1: Think of 35 as 3 tens and 5 ones. </li></ul><ul><li>Multiply 88 x the 5 ones. </li></ul><ul><li>5 x 88 </li></ul>0 4 4 8 5 4 8 3 x O T H
3. 3. Mr. Henson grows tomatoes. There are 35 plants on each tray. Mr. Henson has 88 trays. How many tomato plants does he have in all? <ul><li>Step 2: Multiply 88 by the 3 tens (30) </li></ul><ul><li>Place a zero </li></ul><ul><li>30 x 88 </li></ul>6 4 H 0 4 2 0 4 8 5 2 4 8 3 x O T T
4. 4. Mr. Henson grows tomatoes. There are 35 plants on each tray. Mr. Henson has 88 trays. How many tomato plants does he have in all? <ul><li>Step 3 </li></ul><ul><li>Add the products </li></ul>0 8 0 3, 0 4 6 + 2 0 4 4 5 3 x 8 8 O T H Th
5. 5. Practice 8 3 x 9 2 O T H 2 0 1 1, 0 7 8 + 2 3 2 8 3 x 9 2 7 2 O T H Th
6. 6. Practice 2 6 x 5 \$5 O T H 0 1 4 \$3 , 0 0 3 + 3 0 1 1 2 6 x 5 3 1 \$5 O T H Th
7. 7. Hints <ul><li>When you multiply 2-digit numbers, start by multiplying the ones in the number below. </li></ul><ul><li>When multiplying the tens, don’t forget to use a zero to mark its place value. </li></ul><ul><li>Don’t forget to add numbers that are traded and cross the numbers out when you’ve finished adding them. </li></ul>
8. 8. Try These 2 2 x 7 3 O T H 1 3 x 4 5 O T H 6 2 x 2 4 O T H
9. 9. How is multiplying a 2-digit number like multiplying a 1-digit number? <ul><li>You need to know basic facts. </li></ul><ul><li>You need to understand regrouping. </li></ul>