Mastering 10 or 100 More or Less in Math

In this video, Alexis introduces mental math techniques for adding and subtracting tens and hundreds. The lesson begins with a basic explanation of mental math and its benefits. At a construction site, viewers learn to add hundreds using a number line. The shopping section demonstrates subtracting tens with a practical example of a dress sale. Finally, at the gym, the focus returns to adding hundreds, using a number line to track steps. The video emphasizes visualization techniques to enhance mental math skills.

What is mental math primarily used for?

• Memorizing numbers

• Drawing charts

• Quick addition and subtraction

• Solving complex equations

If you add 10 to 35 using mental math, what is the result?

• 45

• 55

• 40

• 50

What is the main advantage of using mental math?

• Increases physical strength

• Helps in drawing

• Speeds up calculations

• Improves memory

How many bricks were needed in total at the construction site?

• 700

• 1000

• 900

• 800

What concept helps visualize adding 100 more to a number?

• Pie chart

• 100's chart

• Number line

• Bar graph

After a $10 discount, how much does the dress cost?

• $63

• $53

• $43

• $73

What tool is used to visualize 10 less than a number?

• Number line

• Calculator

• 100's chart

• Abacus

Which scenario did not involve using a number line for visualization?

• Shopping for a dress

• At the gym

• At the construction site

• All used a number line

How many steps will the parents walk today at the gym?

• 450 steps

• 250 steps

• 350 steps

• 150 steps

What is the counting increment of the number line used at the gym?

• By 100s

• By 20s

• By 10s

• By 50s