Continuing a Skip-Count
Skip-count by 7’s from 7 to 42.
7, 14, 21, 28, 35, 42
What number is the pattern below skip-counting by?
9, 16, 23, 30, 37, 44, 51
7
458 + 377 =
835
Make the sentence true
80 – 17 = 81 – __________
80 – 17 = 81 –18
Ralph skip-counts by 2’s, starting at 6. Will Ralph say the number 71? Explain how you know.
Ralph will not say 71 because 71 is odd.
Skip-count by 8’s from 8 to 48
8, 16, 24, 32, 40, 48
What number is the pattern below skip-counting by?17, 25, 33, 41, 49, 57, 65
8
What is the most efficient strategy to solve 354 + 298?
Compensating. Change 298 to 300. 354+300-2=652
Make the sentence true.
574 + __________ = 575 + 67
574 + 68 = 575 + 67
Sally runs 9 laps around the track each day. After 8 days, how many laps has Sally run?
72 laps
Skip-count by 5’s from 7 to 32
7, 12, 17, 22, 27, 32
What are the next 4 numbers?
6 , 11 , 16 , 21 , __________ , __________ , __________ , __________
26, 31, 36, 41
What is the most efficent strategy to solve 714 – 199?
Compensation. 714-200+1 OR 715-200.
Make the equation true
478 – __________ = 183
478 – 295 = 183
Each buffalobster has 6 legs. How many legs would a herd of 8 buffalobsters have?
48 legs
Skip-count by 4’s from 5 to 25.
5, 9, 13, 17, 21, 25
If you continue skip-counting by 5’s, which of these numbers will you say?
45 57 90 91
45
What is the most effective strategy to solve
174 + 459 – 74?
174-74=100
459+100=559
Make the equation true
517 – __________ = 481
517 – 36 = 481
Each orangatoad has 4 legs. A group of 9 orangatoads are at the pond, but then 3 leave. What is the difference in the number of legs that were at the pond?
9x4=36
4x3=12
36-12=24
24 legs
Skip count. Fill in the missing numbers.
45 _____ ______ 39 ______ ______33 ______ _______ 29
45, 43, 41, 39, 37, 35, 33, 31, 29
Skip-count by 8’s from 8. These numbers are called the 8’s. What is the largest of the 8’s smaller than 100? Explain how you know
"The number is _______. I know this beacuase ______"
96. I know this because 8 x 12 is 96.
Sally says she can add 98 + 99 + 103 quickly without using the stacking algorithm. Describe a possible “Slacker” strategy that she could use.
Sally should compensate. She should solve the problem as 100+100+103-2-1 OR 100+100+103-3
Complete the fact family
368 + __________ = 600
600 − 368 = __________
600 = 232 + __________
__________ − 232 = __________
368+232=600
600-368=232
600=232+368
600-232=368
Pam skip-counts by 6’s from 473 to 509. What is the last number Pam says before 509?
509-6=503