Tables use number families in the same way as addition and subtraction problems. In a row, the lesser (smaller) numbers added together equal the greatest (largest) number. In a column, the lesser numbers added together equal the greatest number. This can help us fill in data missing from a table.
Here's an activity to help you practice using number families to fill in missing data.
Create a table similar to the one below to show how much time you spend doing activities during the day. Each day, write down the amount of time you spend doing the activity. Be sure to write the amount of time in minutes.
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Time Spent Doing Activities (minutes) |
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Sunday |
Monday |
Tuesday |
Wednesday |
Thursday |
Friday |
Saturday |
Total |
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Homework |
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Talking on the Phone |
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Practicing a Sport |
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Working |
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Total |
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If you do not do one of the activities one day, write a 0 in the appropriate box. If you know you practice soccer for an hour a day for five days, write the total amount for practicing the sport. Remember to write time in minutes: 5 hours = 300 minutes. After a week of filling in the table, determine how much time you spend doing each activity. Make comparisons between how much time you spend doing one activity and how much time you spend doing another activity. Why do you think you spend more or less time doing a certain activity?
Create a chart for the following week and compare times from week one to week two. Are you surprised by the amount of time that changed between activities?
Ready to move on to the next lesson?
Addition and Vertical Number Families in Tables
