Addition Strategies
What type of fact is this?
6 + 6
Doubles Fact
9 + 8 = p
p = 17
13 - 5 = _____
13 - 5 = 8
Write an equation to represent the problem.
Raven draws a line that is 28 cm long. Cameron draws a line that was 17 cm long. How much longer is Raven's line than Cameron's?
Raven's line is 11 cm longer
What type of fact am I?
8 + 2
Make a ten fact
7 + 6 = m
m= 13
____ - 3 = 8
11 - 3 = 8
Ms. Morton buys a new lipstick for $14. She gives the cashier $22. How much change does she get back?
Ms. Morton gets $8 back.
What type of fact am I?
12 + 13
Doubles + 1
14 = 6 + ___
14 = 6 + 8
____ = 19 - 5
14 = 19 - 5
Olivia spends $48 at the mall. Her sister spends $35. How much did they spend in total?
They spent $83 altogether.
Explain how you could use the Make a Ten addition strategy to solve 9 + 6.
9 + 6 = ?
You could use the Make a Ten strategy to solve 9 + 6 by adding 1 to 9 from the 6 and adding 10 + 5.
9 + 6 = 15
6 + 4 + 8 = ____
6 + 4 + 8 = 18
98 - 25 = ____
98 - 25 = 73
Isabel has to read an entire chapter book before school on Monday. She reads 78 pages on Thursday, 25 pages on Friday and 15 pages on Sunday. How many pages did she read?
118 pages
Jason says an 8 + 7 gives you an odd sum. Do you agree or disagree? Explain how you know.
I agree with Jason because and odd plus an even equals an even. 8 + 7 = 15 and 15 is an odd number.
22 = 13 + ____
22 = 13 + 9
____ - 64 = 51
115 - 64 = 51
Alexia's book is 18 cm long. The book is 9 cm longer than Alexia's pencil. How long is the pencil? Which of the following represents this situation?
a. 18 + 9 = p
b. p + 18 = 9
c. 9 - p = 18
d. p + 9 = 18
D. p + 9 = 18