add. write the doubles fact used to solve each one.
0+1=1
6+7 =13
4+3=7
please explain how to use doubles plus 1 and doubles minus 1
how much did maria bean plant grow between day 2 and day 3
double the biggest number then take away one eg 4+4=8-1=7 that is the example of 4+3=7
To solve each of these addition equations using doubles plus 1 and doubles minus 1, let's break down the process step-by-step:
1. Doubles Plus 1:
Doubles plus 1 means adding a number twice (doubling it) and then adding 1 more to the result. This is a useful strategy when one of the numbers is close to a known double.
a) For the equation 0 + 1 = 1:
In this case, both numbers are small, and there is no need to use the "doubles plus 1" strategy since there are no doubles close to either number.
b) For the equation 6 + 7 = 13:
To use the "doubles plus 1," find a known double that is close to 7. Since 6 is a known double (6 + 6 = 12), you can add 1 to 12 to get the answer 13. So, the doubles fact used here is 6 + 6 = 12.
c) For the equation 4 + 3 = 7:
Again, look for a known double close to 3. Since 4 is a known double (4 + 4 = 8), you can subtract 1 from 8 to get the answer 7. So, the doubles fact used here is 4 + 4 = 8.
2. Doubles Minus 1:
Doubles minus 1 means subtracting 1 from a known double. This strategy is helpful when the other number is close to a known double.
a) For the equation 0 + 1 = 1:
As mentioned earlier, there are no doubles involved here, so the doubles minus 1 strategy is not applicable.
b) For the equation 6 + 7 = 13:
Since there are no known doubles that are close to 7, you cannot use the doubles minus 1 strategy here.
c) For the equation 4 + 3 = 7:
You can use the doubles minus 1 strategy with the known double 3. Since 3 is a known double (3 + 3 = 6), you can add 1 to 6 to get the answer 7. So, the doubles fact used here is 3 + 3 = 6.
Overall, you can use the doubles plus 1 strategy when one of the numbers is close to a known double, and there is a need to add 1 more. Similarly, the doubles minus 1 strategy can be used when one number is close to a known double and you must subtract 1. These strategies help simplify addition calculations by leveraging known doubles to find the answers more quickly.