Two-Digit Addition and Subtraction

In this lesson, Maria introduces the concept of adding and subtracting two-digit numbers using models. She demonstrates how to solve basic and advanced addition problems, as well as subtraction, using visual aids. The lesson includes solving a word problem and applying these mathematical concepts to real-world scenarios, such as calculating total costs and comparing prices. The use of columns for addition and subtraction is also explained, providing a comprehensive understanding of these fundamental math skills.

What is the main focus of this lesson?

• Multiplying two-digit numbers

• Adding and subtracting two-digit numbers

• Dividing two-digit numbers

• Solving algebraic equations

How many tens are there in the number 32?

• 3 tens

• 2 tens

• 5 tens

• 4 tens

What is the sum of 32 and 20?

• 52

• 42

• 72

• 62

Which tool can help solve 45 + 13 besides models?

• Ruler

• Abacus

• Compass

• Calculator

What is the sum of 45 and 13?

• 68

• 78

• 58

• 48

In the subtraction example 65 - 30, how many tens are left?

• 4 tens

• 5 tens

• 2 tens

• 3 tens

What is the result of 65 minus 30?

• 25

• 45

• 55

• 35

How many ones are left after subtracting 33 from 54?

• 3 ones

• 2 ones

• 4 ones

• 1 one

What is the result of 54 minus 33?

• 11

• 21

• 31

• 41

How many animals does the farmer have in total?

• 69

• 59

• 89

• 79