By Pamela Dell (Author), Kathryn Harper and Mark Domke (Editors)
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Extra info for Britannica Discovery Library Volume 10 - Numbers
Sometimes we can also tell differences in age, even without numbers. is horse Which g the runnin st? faste is horse h c i h W st? slowe 56 Which perso n watch ing the ra c far aw e is ay? Which perso n looks the oldest ? Which looks t young he est? We can tell these things just by looking. We can also tell by using numbers if we want to! 57 Let’s count and compare! Maria is seven years old. Her brother Marco is nine years old. They are two years apart. Maria’s cousin Sara is six years old. Maria and Sara are one year apart.
For instance, you could do an addition or subtraction problem. Example: Write a 5 on the person’s back, then an addition sign, then a 2. See if the person can tell if you are adding or subtracting. If they said “seven” for the sum above, they would be right! Now everyone else takes a good look at the jar. Then the person in charge of the jar removes it from sight. How many items are in the jar? Each guesser writes down the number he or she thinks is right. The person whose guess comes closest to the real number wins!
Maria’s cousin Sara is six years old. Maria and Sara are one year apart. Jan has some stones arranged in a row. Katya has all her stones in a circle. Count each one’s stones. They both have the same number of stones. Each one has seven stones. Katya gives two of her stones to Jan. Who has more stones now? 58 How stones many does have? Jan How m stones any Katya does have? oldest s the i o h W three? of all s the Who i st? e young How m years any a are M part a and S rco ara? 59 We count with numbers.
Britannica Discovery Library Volume 10 - Numbers by Pamela Dell (Author), Kathryn Harper and Mark Domke (Editors)